repeat vs emit

repeat is a noun but emit is not a noun.

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

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

Other hypernyms of repeat include let loose, let out, utter.

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

repeat (verb)	emit (verb)
happen or occur again	expel (gases or odors)
to say, state, or perform again	express audibly; utter sounds (not necessarily words)
to say again or imitate	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
make or do or perform again
repeat an earlier theme of a composition
do over