subjugate vs keep down

subjugate and keep down both are verbs.

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

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

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

subjugate (verb)	keep down (verb)
make subservient; force to submit or subdue	manage not to throw up
put down by force or intimidation	place a limit on the number of
	put down by force or intimidation