chirp vs emit

chirp is a noun but emit is not a noun.

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

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

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

chirp (noun)	emit (noun)
a sharp sound made by small birds or insects

chirp (verb)	emit (verb)
make high-pitched sounds	expel (gases or odors)
sing in modulation	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.