costs vs reimbursement

costs and reimbursement both are nouns.

Word	Noun	Adjective	Verb	Adverb
costs	Yes	No	No	No
reimbursement	Yes	No	No	No

As nouns, reimbursement is a hypernym of costs; that is, reimbursement is a word with a broader meaning than costs:

costs: pecuniary reimbursement to the winning party for the expenses of litigation
reimbursement: compensation paid (to someone) for damages or losses or money already spent etc.

costs (noun)	reimbursement (noun)
pecuniary reimbursement to the winning party for the expenses of litigation	compensation paid (to someone) for damages or losses or money already spent etc.