There are a total of 725 8-letter words containing 'io', and the number may vary in different dictionaries. You can specify the dictionary and order.
- ablation 13
- ablution 14
- abortion 12
- abrasion 12
- achiotes 13
- acromion 15
- actioned 13
- actioner 12
- adaption 13
- addition 11
- adhesion 12
- adnation 11
- adoption 13
- aeration 9
- affusion 16
- agiotage 12
- agnation 12
- alations 10
- allusion 12
- alluvion 16
- ambition 15
- amnionic 16
- amniotes 12
- amniotic 15
- amotions 12
- amphioxi 23
- angiomas 14
- anterior 9
- antiriot 9
- antlions 11
- aphelion 15
- apiology 16
- arpeggio 15
- auctions 13
- audition 11
- aversion 13
- aviation 13
- avionics 16
- avoision 13
- avulsion 15
- axiology 20
- bastions 12
- behavior 17
- billions 14
- bioassay 13
- biobanks 19
- biochips 19
- biocidal 16
- biocides 15
- bioclast 15
- bioclean 16
- biocycle 20
- bioethic 16
- biofilms 18
- biofuels 16
- biogases 13
- biogenic 17
- bioherms 16
- biologic 17
- biolyses 14
- biolysis 14
- biolytic 17
- biometry 16
- biomorph 19
- bionomic 18
- bioplasm 18
- biopsied 15
- biopsies 14
- bioscope 17
- bioscopy 19
- biotechs 16
- biotical 15
- biotites 11
- biotitic 14
- biotopes 14
- biotoxin 19
- biotrons 12
- biotypes 16
- biotypic 19
- biovular 17
- bocaccio 20
- braciola 15
- braciole 15
- brioches 16
- brionies 12
- bullions 15
- cabriole 15
- calliope 16
- campions 18
- capriole 15
- captions 15
- captious 15
- cardioid 13
- cariocas 14
- carioles 12
- carriole 12
- carrions 12
- cationic 15
- cautions 13
- cautious 13
- cessions 12
- champion 20
- chariots 13
- cheerios 13
- cheviots 17
- chorioid 14
- chorions 14
- cioppino 18
- citation 12
- clarions 13
- coaction 15
- coercion 15
- cohesion 14
- coitions 12
- conation 13
- conioses 12
- coniosis 12
- cooption 15
- creation 12
- criollos 13
- cullions 15
- curation 13
- curculio 17
- cushions 15
- cushiony 17
- darioles 10
- decision 13
- decurion 14
- deionise 10
- deionize 19
- delation 11
- deletion 11
- delusion 12
- demotion 13
- deration 10
- derision 10
- devotion 14
- dictions 13
- diecious 13
- dilation 11
- dilution 12
- diluvion 16
- diobolon 14
- diocesan 13
- dioceses 12
- dioecies 12
- dioecism 15
- dioicous 13
- diolefin 14
- diopside 13
- dioptase 12
- diopters 12
- dioptral 13
- dioptres 12
- dioptric 15
- dioramas 12
- dioramic 15
- diorites 9
- dioritic 12
- dioxanes 17
- dioxides 17
- disunion 12
- division 14
- dominion 14
- donation 11
- dotation 10
- doupioni 14
- duration 11
- eclosion 13
- edacious 13
- editions 10
- eduction 14
- effusion 16
- egestion 11
- ejection 21
- elations 10
- election 13
- elisions 10
- elusions 11
- elutions 11
- emersion 12
- emission 12
- emotions 12
- emulsion 14
- enaction 13
- enations 10
- envision 14
- eobionts 12
- epyllion 16
- equation 19
- erasions 9
- erection 12
- erosions 9
- eruption 13
- estriols 9
- etiolate 9
- etiology 13
- evasions 13
- evection 16
- eversion 13
- eviction 16
- evulsion 15
- exaction 19
- excision 19
- exertion 16
- eximious 19
- exterior 15
- factions 15
- factious 15
- falchion 18
- fashions 14
- fashious 14
- fellatio 13
- fenthion 15
- fermions 15
- fetation 12
- fictions 15
- finochio 17
- fissions 12
- fixation 19
- flection 16
- flexions 20
- fluxions 21
- folioing 15
- folioles 13
- fortiori 11
- fraction 15
- friction 15
- fruition 13
- function 17
- fusional 14
- galliots 12
- ganglion 15
- gelation 12
- geraniol 12
- gladiola 13
- gladioli 13
- gliomata 14
- gloriole 12
- glorious 12
- gnathion 14
- gobioids 14
- gracioso 13
- gracious 14
- grazioso 19
- grunions 13
- guaiocum 18
- gumption 18
- gyration 13
- halation 12
- haviours 15
- hellions 13
- hemiolas 14
- hemiolia 14
- himation 14
- ideation 10
- idiocies 12
- idiolect 13
- idiotism 12
- idiotype 14
- ignition 12
- illation 11
- illusion 12
- inaction 13
- incision 13
- inferior 12
- infixion 20
- infusion 14
- inhesion 12
- intaglio 12
- interior 9
- invasion 14
- iodating 12
- iodation 10
- iodinate 10
- iodising 12
- iodizers 18
- iodizing 21
- iodoform 15
- iodophor 14
- iodopsin 13
- ionicity 14
- ionisers 9
- ionising 12
- ionizers 18
- ionizing 21
- ionogens 12
- ionomers 12
- iotacism 14
- jillions 20
- junction 23
- lampions 16
- lavation 14
- laxation 17
- lections 13
- legation 12
- legioned 13
- lenition 11
- lesioned 11
- libation 13
- libeccio 18
- ligation 12
- lionfish 15
- lionhead 13
- lionised 11
- lioniser 10
- lionises 10
- lionized 20
- lionizer 19
- lionizes 19
- lionlike 15
- lobation 13
- location 13
- locution 14
- lothario 11
- lunation 12
- luscious 14
- luxation 18
- mafiosos 14
- maiolica 15
- mandioca 16
- maniocas 15
- mansions 13
- mediocre 15
- melodion 14
- mentions 13
- milliohm 18
- millions 14
- missions 12
- misunion 14
- modiolus 14
- monition 13
- morrions 12
- motional 13
- motioned 13
- motioner 12
- moviolas 16
- mullions 15
- munition 14
- munnions 15
- mutation 13
- myriopod 17
- natation 10
- national 11
- negation 12
- nidation 11
- niobates 12
- niobiums 16
- nivation 14
- nolition 11
- nonionic 14
- nonunion 13
- notation 10
- notional 11
- novation 14
- nutation 11
- oblation 13
- oblivion 17
- occasion 15
- odiously 13
- oestriol 9
- omission 12
- opinions 13
- optional 13
- optioned 13
- optionee 12
- orations 9
- oratorio 8
- ostiolar 9
- ostioles 9
- otiosely 11
- otiosity 10
- ovariole 13
- ovations 13
- oxyanion 19
- pactions 15
- passions 12
- patriots 11
- pavilion 17
- paviours 16
- pensione 13
- pensioni 13
- pensions 13
- periodic 15
- periodid 13
- periotic 14
- pervious 16
- petiolar 12
- petioled 13
- petioles 12
- petition 12
- pillions 14
- pinioned 14
- pioneers 12
- pliosaur 13
- pliotron 13
- plosions 13
- pluviose 17
- pluvious 18
- portions 12
- position 12
- postriot 11
- potation 12
- precious 15
- presidio 12
- preunion 14
- previous 16
- priorate 11
- prioress 11
- priories 11
- priority 13
- prounion 14
- pulsions 14
- pulvilio 18
- punition 14
- pupation 16
- quarrion 19
- question 19
- radioing 12
- radioman 13
- radiomen 13
- rampions 15
- rational 10
- rationed 10
- raviolis 13
- reaction 12
- recision 12
- reductio 13
- regional 12
- relation 10
- religion 12
- remotion 12
- reunions 11
- revision 13
- rogation 11
- rosoglio 11
- rosolios 9
- rotation 9
- ructions 13
- ructious 13
- sanction 13
- saviours 13
- scabiosa 14
- scabious 15
- scallion 14
- scansion 13
- scariose 11
- scarious 12
- scenario 12
- sciolism 15
- sciolist 12
- scission 12
- scolioma 15
- scorpion 15
- scullion 15
- sealions 10
- sections 12
- sedation 10
- sedition 10
- seignior 11
- semioses 11
- semiosis 11
- semiotic 14
- senecios 12
- seraglio 11
- sessions 9
- signiori 11
- signiors 11
- signiory 13
- silentio 10
- skillion 15
- skioring 15
- solation 10
- solution 11
- sorption 12
- spacious 15
- specious 15
- sponsion 13
- spurious 13
- stallion 11
- stations 9
- stiction 12
- stocious 12
- studious 11
- suasions 10
- suctions 13
- sudation 11
- superior 12
- swaption 15
- symbions 17
- symbiont 17
- symbiote 16
- symbiots 16
- tactions 12
- taenioid 10
- taleggio 13
- talionis 10
- tampions 15
- tapiocas 14
- taxation 16
- tensions 10
- ternions 10
- thermion 14
- thionate 11
- thionine 12
- thionins 12
- thionyls 14
- thiophen 16
- thiotepa 13
- thiourea 11
- tompions 15
- torsions 9
- tortious 9
- traction 12
- trillion 11
- triolets 9
- trioxide 16
- trioxids 16
- trunnion 12
- tuitions 10
- ulterior 10
- unctions 14
- unionise 11
- unionism 14
- unionist 11
- unionize 20
- urushiol 13
- usurious 11
- uxorious 17
- vacation 16
- variolar 13
- variolas 13
- varioles 13
- variorum 16
- venation 14
- versions 13
- vexation 20
- vibrioid 16
- vibrions 16
- violable 17
- violably 19
- violated 14
- violater 13
- violates 13
- violator 13
- violence 17
- violists 13
- viologen 16
- violones 14
- viomycin 21
- visional 14
- visioned 14
- vitriols 13
- vocation 16
- volition 14
- volution 15
- warriors 11
- zabaione 21
- zillions 20
- zonation 19
- aeradios 9
- biometer 12
- biosolid 11
- biowaste 13
- caesious 10
- cassiope 12
- fashiony 17
- haliotes 11
- haliotis 11
- juniored 16
- liriopes 10
- miosises 10
- niobites 10
- pereions 10
- pliocene 12
- pliofilm 15
- preradio 11
- riotings 9
- semiopen 12
- semioval 13
- abusions 10
- alerions 8
- allerion 8
- amations 10
- ameioses 10
- ameiosis 10
- annexion 15
- besognio 11
- bibation 12
- bioblast 12
- biofacts 15
- biograph 16
- biophore 15
- biophors 15
- bioplast 12
- biotroph 15
- borachio 15
- cantions 10
- capuccio 16
- chiliois 13
- cibation 12
- coctions 12
- coraggio 12
- diorisms 11
- ebionise 10
- ebionism 12
- ebionize 19
- emiction 12
- emptions 12
- encomion 12
- erionite 8
- etaerios 8
- etherion 11
- etiolins 8
- exomions 17
- fasciola 13
- fasciole 13
- fauchion 16
- fiddious 13
- filioque 20
- franions 11
- furiosos 11
- fushions 14
- gabioned 12
- gillions 9
- gladiole 10
- gloriosa 9
- grillion 9
- gumphion 16
- hallions 11
- heliodor 12
- helioses 11
- heliosis 11
- hemiolic 15
- hemiones 13
- hemionus 13
- hemiopia 15
- hemiopic 17
- histioid 12
- histrion 11
- histrios 11
- idiogram 12
- idiotish 12
- illision 8
- inustion 8
- iodisers 9
- iodurets 9
- iodyrite 12
- irrision 8
- jobation 17
- limation 10
- lioncels 10
- lionisms 10
- lionlier 8
- mandiocs 13
- meiocyte 15
- meionite 10
- mersions 10
- mictions 12
- mixtions 17
- modiolar 11
- murrions 10
- nepionic 12
- noctilio 10
- nodation 9
- nudation 9
- onionier 8
- onioning 9
- oragious 9
- orarions 8
- orillion 8
- ovarious 11
- pacation 12
- paiockes 16
- panchion 15
- papilios 12
- perioded 12
- periosts 10
- petitios 10
- pionings 11
- plerions 10
- pompions 14
- preludio 11
- pression 10
- psionics 12
- pumpions 14
- rangiora 9
- rections 10
- refusion 11
- riotises 8
- riotizes 17
- riotries 8
- rullions 8
- runnions 8
- scholion 13
- sciolous 10
- scontion 10
- scorious 10
- sepiosts 10
- sliotars 8
- soffioni 14
- stellion 8
- stillion 8
- stotious 8
- stradiot 9
- subaudio 11
- subprior 12
- taglioni 9
- talionic 10
- tarsioid 9
- tenebrio 10
- tenuious 8
- tersions 8
- thiophil 16
- timariot 10
- tordions 9
- triolein 8
- trionyms 13
- turdions 9
- unitions 8
- villagio 12
- violents 11
- visioner 11
- vocalion 13
- yttrious 11
There are 725 8-letter words containing io in the well-known word game dictionary, 557 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 708 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 560 in the Words with Friends (WWF) dictionary.
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