stamp down vs squelch

stamp down is not a noun while squelch is a noun.

Word	Noun	Adjective	Verb	Adverb
stamp down	No	No	Yes	No
squelch	Yes	No	Yes	No

As verbs, squelch is a hyponym of stamp down; that is, squelch is a word with a more specific, narrower meaning than stamp down:

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

stamp down (verb)	squelch (verb)
bring under control by force or authority	suppress or crush completely
	to compress with violence, out of natural shape or condition
	walk through mud or mire
	make a sucking sound