grunt vs emit

grunt is a noun but emit is not a noun.

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

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

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

grunt (noun)	emit (noun)
medium-sized tropical marine food fishes that utter grunting sounds when caught
the short low gruff noise of the kind made by hogs
an unskilled or low-ranking soldier or other worker

grunt (verb)	emit (verb)
issue a grunting, low, animal-like noise	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.