retread vs recap

retread and recap both are nouns.

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

As nouns, retread and recap are synonyms defined as:

retread and recap: a used automobile tire that has been remolded to give it new treads

retread (noun)	recap (noun)
a used automobile tire that has been remolded to give it new treads	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

retread (verb)	recap (verb)
give new treads to (a tire)	summarize briefly
use again in altered form