repeat vs summarize

repeat is a noun but summarize is not a noun.

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

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

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

repeat (verb)	summarize (verb)
happen or occur again	give a summary (of)
to say, state, or perform again	be a summary of
to say again or imitate
make or do or perform again
repeat an earlier theme of a composition
do over