There are a total of 12 6-letter words containing 'bio', and the number may vary in different dictionaries. You can specify the dictionary and order.

• biogas ₁₁
• biogen ₁₂
• biomes ₁₂
• bionic ₁₃
• bionts ₁₀
• biopic ₁₅
• biopsy ₁₄
• biotas ₉
• biotic ₁₂
• biotin ₁₀
• gabion ₁₂
• biodot ₉

There are 12 6-letter words containing bio in the well-known word game dictionary, 11 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 12 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 11 in the Words with Friends (WWF) dictionary.