There are a total of 1357 8-letter words starting with the letter 'o', and the number may vary in different dictionaries. You can specify the dictionary and order.
- oophytes 15
- oophytic 18
- oosperms 14
- oosphere 13
- oospores 11
- oosporic 14
- oothecae 13
- oothecal 14
- ooziness 18
- opalesce 15
- opalines 13
- opalised 11
- opalized 20
- opaquely 24
- opaquest 21
- opaquing 24
- openable 16
- opencast 15
- openings 15
- openness 13
- openside 13
- openwork 19
- operable 15
- operably 17
- operandi 13
- operands 13
- operants 12
- operated 12
- operates 11
- operatic 14
- operator 11
- opercele 15
- opercula 16
- opercule 16
- operetta 11
- ophidian 15
- ophiuran 13
- ophiuras 13
- ophiurid 14
- opiating 14
- opificer 15
- opinable 12
- opinicus 12
- opinions 13
- opiumism 18
- opopanax 22
- opoponax 22
- oporices 12
- opossums 15
- oppidans 16
- oppilant 16
- oppilate 15
- opponens 16
- opponent 16
- opposers 14
- opposing 17
- opposite 14
- oppugned 19
- oppugner 18
- opsimath 16
- opsonify 17
- opsonins 13
- opsonise 12
- opsonium 12
- opsonize 21
- optative 15
- opticals 15
- optician 15
- opticist 14
- optimate 14
- optimise 14
- optimism 17
- optimist 14
- optimize 23
- optimums 18
- optional 13
- optioned 13
- optionee 12
- optology 14
- optronic 15
- opulence 17
- opulency 19
- opuluses 10
- opuntias 13
- opuscles 12
- opuscula 17
- opuscule 17
- oquassas 18
- oracling 11
- oracular 13
- oragious 9
- oralisms 12
- oralists 9
- orangery 13
- orangest 9
- orangier 11
- orangish 13
- orarians 8
- orarions 8
- orariums 10
- orations 9
- oratorio 8
- oratress 8
- oratures 8
- orbitals 12
- orbiters 11
- orbities 10
- orbiting 14
- orchards 14
- orchella 13
- orcheses 13
- orchesis 13
- orchilla 13
- orchises 13
- orchitic 16
- orchitis 13
- orcinols 13
- ordained 11
- ordainer 10
- ordalian 9
- ordalium 11
- orderers 9
- ordering 12
- ordinals 11
- ordinand 12
- ordinant 9
- ordinars 9
- ordinary 12
- ordinate 10
- ordinees 9
- ordnance 14
- ordurous 9
- orective 15
- oreganos 11
- oreodont 9
- oreology 12
- oreweeds 12
- orexises 15
- organdie 12
- organics 14
- organise 11
- organism 14
- organist 11
- organity 12
- organize 20
- organons 12
- organums 15
- organzas 20
- orgasmed 14
- orgasmic 16
- orgastic 13
- orgiasts 9
- orgulous 13
- oribatid 12
- orichalc 17
- orielled 9
- oriental 10
- oriented 10
- orienter 8
- orifexes 18
- orifices 14
- origamis 13
- origanes 9
- origanum 15
- original 12
- orillion 8
- orinasal 10
- ornament 13
- ornately 12
- ornatest 8
- ornerier 9
- ornithes 11
- ornithic 14
- orogenic 14
- orometer 11
- oronasal 8
- oropesas 10
- orphaned 15
- orphical 17
- orphisms 15
There are 1357 8-letter words starting with the letter o in the well-known word game dictionary, 1046 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 1299 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 1063 in the Words with Friends (WWF) dictionary.
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