wolf-whistle vs emit

wolf-whistle and emit both are verbs.

Word	Noun	Adjective	Verb	Adverb
wolf-whistle	No	No	Yes	No
emit	No	No	Yes	No

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

Other hypernyms of wolf-whistle include let loose, let out, utter.

wolf-whistle (verb)	emit (verb)
whistle or howl approvingly at a female, of males	expel (gases or odors)
	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.