keep back vs regulate

keep back and regulate both are verbs.

Word	Noun	Adjective	Verb	Adverb
keep back	No	No	Yes	No
regulate	No	No	Yes	No

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

keep back (verb)	regulate (verb)
prevent the action or expression of	fix or adjust the time, amount, degree, or rate of
hold back; refuse to hand over or share	restrain the emission of (sound, fluid, etc.)
secure and keep for possible future use or application	shape or influence; give direction to
	bring into conformity with rules or principles or usage; impose regulations