peep vs emit

peep is a noun but emit is not a noun.

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

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

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

peep (noun)	emit (noun)
a secret look
the short weak cry of a young bird

peep (verb)	emit (verb)
appear as though from hiding	expel (gases or odors)
make high-pitched sounds	express audibly; utter sounds (not necessarily words)
speak in a hesitant and high-pitched tone of voice	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
look furtively
cause to come into view