repeat vs iterate

repeat is a noun but iterate is not a noun.

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

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

Other hyponyms of repeat include cycle.

As verbs, repeat and iterate are synonyms defined as:

Other synonyms of repeat include ingeminate, reiterate, restate, retell.

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

repeat (verb)	iterate (verb)
happen or occur again	run or be performed again
to say, state, or perform again	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