hush up vs subdue

hush up and subdue both are verbs.

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

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

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

hush up (verb)	subdue (verb)
cause to be quiet or not talk	correct by punishment or discipline
cover up a misdemeanor, fault, or error	bring under control by force or authority
	make subordinate, dependent, or subservient
	get on top of; deal with successfully
	hold within limits and control
	put down by force or intimidation