iterate vs repeat

iterate is not a noun while repeat is a noun.

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

As verbs, repeat is a hypernym of iterate; that is, repeat is a word with a broader meaning than iterate:

Other hypernyms of iterate include recur.

As verbs, iterate and repeat are synonyms defined as:

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

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

iterate (verb)	repeat (verb)
run or be performed again	happen or occur 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