squelch vs subdue

squelch is a noun but subdue is not a noun.

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

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

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

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

squelch (verb)	subdue (verb)
suppress or crush completely	correct by punishment or discipline
to compress with violence, out of natural shape or condition	bring under control by force or authority
walk through mud or mire	make subordinate, dependent, or subservient
make a sucking sound	get on top of; deal with successfully
	hold within limits and control
	put down by force or intimidation