suppress vs hush up

suppress and hush up both are verbs.

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

As verbs, hush up is a hyponym of suppress; that is, hush up is a word with a more specific, narrower meaning than suppress:

suppress (verb)	hush up (verb)
bring under control by force or authority	cause to be quiet or not talk
lessen to the point of stopping	cover up a misdemeanor, fault, or error
put out of one's consciousness
consciously restrain from showing; of emotions, desires, impulses, or behavior
come down on or keep down by unjust use of one's authority