crush vs keep down

crush is a noun but keep down is not a noun.

Word	Noun	Adjective	Verb	Adverb
crush	Yes	No	Yes	No
keep down	No	No	Yes	No

As verbs, keep down is a hyponym of crush; that is, keep down is a word with a more specific, narrower meaning than crush:

Other hyponyms of crush include quash, reduce, repress, subdue, subjugate.

crush (noun)	keep down (noun)
the act of crushing
temporary love of an adolescent
a dense crowd of people
leather that has had its grain pattern accentuated

crush (verb)	keep down (verb)
break into small pieces	manage not to throw up
become injured, broken, or distorted by pressure	place a limit on the number of
come out better in a competition, race, or conflict	put down by force or intimidation
make ineffective
to compress with violence, out of natural shape or condition
crush or bruise
humiliate or depress completely
come down on or keep down by unjust use of one's authority