repeat vs rephrase

repeat is a noun but rephrase is not a noun.

Word	Noun	Adjective	Verb	Adverb
repeat	Yes	No	Yes	No
rephrase	No	No	Yes	No

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

repeat (noun)	rephrase (noun)
an event that repeats

repeat (verb)	rephrase (verb)
happen or occur again	express the same message in different words
to say, state, or perform again
to say again or imitate
make or do or perform again
repeat an earlier theme of a composition
do over