recap vs rehash

recap and rehash both are nouns.

Word	Noun	Adjective	Verb	Adverb
recap	Yes	No	Yes	No
rehash	Yes	No	Yes	No

As verbs, rehash is a hyponym of recap; that is, rehash is a word with a more specific, narrower meaning than recap:

Other hyponyms of recap include hash over, retrograde.

recap (noun)	rehash (noun)
a summary at the end that repeats the substance of a longer discussion	old material that is slightly reworked and used again
a used automobile tire that has been remolded to give it new treads

recap (verb)	rehash (verb)
summarize briefly	go back over
	present or use over, with no or few changes