squeal vs emit

squeal is a noun but emit is not a noun.

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

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

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

squeal (noun)	emit (noun)
a high-pitched howl

squeal (verb)	emit (verb)
confess to a punishable or reprehensible deed, usually under pressure	expel (gases or odors)
utter a high-pitched cry, characteristic of pigs	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.