There are a total of 46 8-letter words containing 'geo', and the number may vary in different dictionaries. You can specify the dictionary and order.

• bludgeon ₁₇
• bourgeon ₁₅
• burgeons ₁₅
• dudgeons ₁₄
• dungeons ₁₄
• epigeous ₁₄
• geocache ₁₈
• geodesic ₁₄
• geodetic ₁₄
• geoducks ₁₉
• geognosy ₁₅
• geologer ₁₃
• geologic ₁₆
• geomancy ₁₉
• geomatic ₁₆
• geometer ₁₃
• geometry ₁₅
• geoparks ₁₇
• geophagy ₁₉
• geophone ₁₆
• geophyte ₁₇
• geoponic ₁₇
• geoprobe ₁₆
• georgics ₁₅
• geotaxes ₁₇
• geotaxis ₁₇
• gorgeous ₁₃
• gudgeons ₁₅
• pledgeor ₁₅
• smidgeon ₁₅
• sturgeon ₁₂
• surgeons ₁₂
• trudgeon ₁₃
• widgeons ₁₅
• pigeonry ₁₄
• geocarpy ₁₆
• geofacts ₁₄
• geognost ₁₀
• geogonic ₁₂
• geolatry ₁₂
• geomants ₁₁
• geomyoid ₁₅
• geotherm ₁₄
• murgeons ₁₁
• pidgeons ₁₂
• pigeoned ₁₂

There are 46 8-letter words containing geo in the well-known word game dictionary, 33 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 43 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 34 in the Words with Friends (WWF) dictionary.