There are a total of 132 8-letter words containing 'son', and the number may vary in different dictionaries. You can specify the dictionary and order.

• absonant ₁₃
• advowson ₁₇
• arsonist ₉
• arsonous ₁₀
• assonant ₁₀
• assonate ₉
• bedsonia ₁₃
• benisons ₁₃
• birdsong ₁₅
• blousons ₁₄
• caissons ₁₂
• cassones ₁₂
• cavesson ₁₆
• chansons ₁₅
• crimsons ₁₅
• dapsones ₁₃
• diapason ₁₃
• duopsony ₁₆
• ecdysone ₁₅
• ecdysons ₁₅
• empoison ₁₅
• essonite ₉
• evensong ₁₆
• folksong ₁₉
• frissons ₁₂
• gambeson ₁₇
• garrison ₁₁
• grandson ₁₃
• imprison ₁₅
• isonomic ₁₅
• jettison ₁₈
• johnsons ₂₁
• keelsons ₁₄
• lessoned ₁₁
• lewisson ₁₃
• liaisons ₁₀
• madisons ₁₃
• malisons ₁₃
• masoning ₁₅
• opsonify ₁₇
• opsonins ₁₃
• opsonise ₁₂
• opsonize ₂₁
• parisons ₁₂
• parsonic ₁₅
• partsong ₁₄
• personae ₁₂
• personal ₁₃
• personam ₁₅
• personas ₁₂
• poisoned ₁₃
• poisoner ₁₂
• prisoned ₁₃
• prisoner ₁₂
• raisonne ₁₀
• reasoned ₁₀
• reasoner ₉
• reseason ₉
• resonant ₁₀
• resonate ₉
• seasonal ₁₀
• seasoned ₁₀
• seasoner ₉
• singsong ₁₄
• sonances ₁₃
• sonantal ₁₁
• sonantic ₁₃
• sonarman ₁₃
• sonarmen ₁₃
• sonatina ₁₀
• sonatine ₁₀
• songbird ₁₅
• songbook ₁₈
• songfest ₁₄
• songform ₁₇
• songless ₁₂
• songlike ₁₆
• songline ₁₃
• songster ₁₁
• sonhoods ₁₂
• sonicate ₁₂
• sonneted ₁₁
• sonobuoy ₁₅
• sonogram ₁₄
• sonorant ₁₀
• sonority ₁₁
• sonorous ₁₀
• sonships ₁₄
• sonsiest ₉
• sponsons ₁₃
• stemsons ₁₂
• stepsons ₁₂
• sternson ₁₀
• subsonic ₁₆
• swansong ₁₅
• telsonic ₁₃
• trahison ₁₁
• treasons ₉
• unisonal ₁₂
• unperson ₁₄
• unreason ₁₁
• unsonsie ₁₁
• venisons ₁₄
• warisons ₁₂
• whoreson ₁₄
• classons ₁₀
• masonite ₁₀
• pocosons ₁₂
• stetsons ₈
• stillson ₈
• worksong ₁₆
• arsonite ₈
• besonian ₁₀
• cloisons ₁₀
• herisson ₁₁
• isonomes ₁₀
• mansonry ₁₃
• opsonium ₁₂
• poissons ₁₀
• poysoned ₁₄
• scoinson ₁₀
• sondages ₁₀
• sondelis ₉
• songkoks ₁₇
• sonliest ₈
• squarson ₁₇
• subsongs ₁₁
• unpoison ₁₀
• unprison ₁₀
• unseason ₈
• warrison ₁₁
• wavesons ₁₄

There are 132 8-letter words containing son in the well-known word game dictionary, 101 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 125 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 105 in the Words with Friends (WWF) dictionary.