"Claim" is a verb, noun, and adjective, but it's not a prefix. A prefix is a word part added to the beginning of a word to modify its meaning.
Possible reasons for your question:
* You might be thinking of a word with a similar meaning to "claim," such as "assertion", "declaration", or "pretension".
* You might be thinking of a prefix that has a similar meaning to "claim," such as "pre-" (meaning "before") or "pro-" (meaning "for").
If you could provide more context or examples, I can help you better understand what you're looking for.