How many words can you make out of bio?

Answer 1

The word 'bio' is generally used as a prefix (bio-) as in 'Biology', 'biodiversity', and so on.

It is, though, used alone as a noun, 'bio', meaning a biographical sketch or precis.

Otherwise, the only other two words I can think of using the letters b i o is 'obi', which comes from a Japanese word meaning a broad sash usually worn with a formal kimono, and 'Ibo', which refers to a people inhabiting the lower Niger region in Africa, and comes to English from those people.