retell vs tell

retell and tell both are verbs.

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

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

retell (verb)	tell (verb)
to say, state, or perform again	discern or comprehend
render verbally	mark as different
make into fiction	let something be known
	narrate or give a detailed account of
	give instructions to or direct somebody to do something with authority
	give evidence
	express in words
	inform positively and with certainty and confidence