There are a total of 94 8-letter words containing 'form', and the number may vary in different dictionaries. You can specify the dictionary and order.

• aeriform ₁₄
• arciform ₁₇
• artforms ₁₄
• auriform ₁₅
• ausforms ₁₅
• biformed ₁₈
• coliform ₁₈
• conforms ₁₈
• coniform ₁₈
• cubiform ₂₁
• cuniform ₁₉
• deformed ₁₆
• deformer ₁₅
• ensiform ₁₅
• filiform ₁₈
• flatform ₁₈
• formable ₁₈
• formalin ₁₆
• formally ₁₈
• formants ₁₅
• formates ₁₄
• formerly ₁₇
• formless ₁₅
• formulae ₁₆
• formulas ₁₆
• formwork ₂₁
• freeform ₁₇
• fusiform ₁₈
• gasiform ₁₆
• gruiform ₁₇
• haloform ₁₇
• informal ₁₆
• informed ₁₆
• informer ₁₅
• iodoform ₁₅
• janiform ₂₄
• landform ₁₇
• lifeform ₁₈
• lyriform ₁₇
• misforms ₁₇
• napiform ₁₈
• omniform ₁₈
• paraform ₁₇
• pediform ₁₈
• performs ₁₇
• piciform ₂₀
• piliform ₁₈
• piriform ₁₇
• pisiform ₁₇
• planform ₁₉
• platform ₁₈
• postform ₁₇
• preforms ₁₇
• proforma ₁₇
• proforms ₁₇
• pyriform ₁₉
• ramiform ₁₇
• reformat ₁₄
• reformed ₁₅
• reformer ₁₄
• reinform ₁₅
• reniform ₁₅
• retiform ₁₄
• rotiform ₁₄
• setiform ₁₄
• slipform ₁₈
• songform ₁₇
• subforms ₁₈
• tubiform ₁₈
• unciform ₁₉
• unformed ₁₇
• uniforms ₁₆
• ursiform ₁₅
• variform ₁₈
• vasiform ₁₈
• waveform ₂₁
• formably ₁₈
• formicas ₁₅
• isoforms ₁₃
• disforms ₁₄
• enformed ₁₄
• formated ₁₄
• formiate ₁₃
• formings ₁₄
• formular ₁₃
• lavaform ₁₆
• longform ₁₄
• maniform ₁₅
• muriform ₁₅
• natiform ₁₃
• nubiform ₁₅
• paliform ₁₅
• raniform ₁₃
• unformal ₁₃

There are 94 8-letter words containing form in the well-known word game dictionary, 71 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 87 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 76 in the Words with Friends (WWF) dictionary.