squelch vs suppress

squelch is a noun but suppress is not a noun.

Word	Noun	Adjective	Verb	Adverb
squelch	Yes	No	Yes	No
suppress	No	No	Yes	No

As verbs, suppress is a hypernym of squelch; that is, suppress is a word with a broader meaning than squelch:

Other hypernyms of squelch include conquer, stamp down, subdue.

squelch (noun)	suppress (noun)
an electric circuit that cuts off a receiver when the signal becomes weaker than the noise
a crushing remark

squelch (verb)	suppress (verb)
suppress or crush completely	bring under control by force or authority
to compress with violence, out of natural shape or condition	lessen to the point of stopping
walk through mud or mire	put out of one's consciousness
make a sucking sound	consciously restrain from showing; of emotions, desires, impulses, or behavior
	come down on or keep down by unjust use of one's authority