Here's the thing: "In" is usually a prefix that means "not" or "into." But it doesn't typically stand alone as a prefix that can be added to other words.
However, there are some examples where it could be *interpreted* as a prefix in a broader sense, though these are not common:
* "Inside" - While "in" is part of the word "inside," "inside" is more of a complete word meaning "within."
* "Inward" - Similar to "inside," "inward" is a whole word meaning "toward the inside."
Let me know if you have other word puzzles you'd like to solve!