shut up vs subdue

shut up is an adjective but subdue is not an adjective.

Word	Noun	Adjective	Verb	Adverb
shut up	No	Yes	Yes	No
subdue	No	No	Yes	No

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

Other hypernyms of shut up include conquer, stamp down, suppress.

shut up (adjective)	subdue (adjective)
closely confined

shut up (verb)	subdue (verb)
cause to be quiet or not talk	correct by punishment or discipline
refuse to talk or stop talking; fall silent	bring under control by force or authority
place in a place where something cannot be removed or someone cannot escape	make subordinate, dependent, or subservient
	get on top of; deal with successfully
	hold within limits and control
	put down by force or intimidation