paraphrase vs retell

paraphrase is a noun but retell is not a noun.

Word	Noun	Adjective	Verb	Adverb
paraphrase	Yes	No	Yes	No
retell	No	No	Yes	No

As verbs, retell is a hypernym of paraphrase; that is, retell is a word with a broader meaning than paraphrase:

Other hypernyms of paraphrase include ingeminate, iterate, reiterate, repeat, restate.

paraphrase (noun)	retell (noun)
rewording for the purpose of clarification

paraphrase (verb)	retell (verb)
express the same message in different words	to say, state, or perform again
	render verbally
	make into fiction