Is cohabit a suffix or prefix?

"Cohabit" is neither a suffix nor a prefix. It is a complete word meaning "to live together, especially as a married couple."

Let's break it down:

* Suffixes are added to the end of a word to change its meaning or grammatical function (e.g., -ing, -ly, -ment).

* Prefixes are added to the beginning of a word to change its meaning (e.g., un-, re-, pre-).

"Cohabit" stands alone as a verb.