There are a total of 13 8-letter words containing 'micro', and the number may vary in different dictionaries. You can specify the dictionary and order.

• microbar ₁₇
• microbes ₁₇
• microbic ₂₀
• microbus ₁₈
• microcar ₁₇
• microdot ₁₅
• microhms ₁₉
• microlux ₂₃
• micromho ₁₉
• micropig ₁₉
• omicrons ₁₅
• microcap ₁₆
• microjet ₁₉

There are 13 8-letter words containing micro 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.