subdue vs keep down

subdue and keep down both are verbs.

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

As verbs, subdue and keep down are synonyms defined as:

Other synonyms of subdue include quash, reduce, repress, subjugate.

subdue (verb)	keep down (verb)
correct by punishment or discipline	manage not to throw up
bring under control by force or authority	place a limit on the number of
make subordinate, dependent, or subservient	put down by force or intimidation
get on top of; deal with successfully
hold within limits and control
put down by force or intimidation