rehash vs recap

rehash and recap both are nouns.

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

As verbs, recap is a hypernym of rehash; that is, recap is a word with a broader meaning than rehash:

Other hypernyms of rehash include recapitulate.

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

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