squelch vs stamp down

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

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

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

Other hypernyms of squelch include conquer, subdue, suppress.

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

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