quack vs emit

quack is a noun but emit is not a noun.

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

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

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

quack (noun)	emit (noun)
the harsh sound of a duck
an untrained person who pretends to be a physician and who dispenses medical advice

quack (adjective)	emit (adjective)
medically unqualified

quack (verb)	emit (verb)
act as a medical quack or a charlatan	expel (gases or odors)
utter quacking noises	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.