prevent vs keep out

prevent and keep out both are verbs.

Word	Noun	Adjective	Verb	Adverb
prevent	No	No	Yes	No
keep out	No	No	Yes	No

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

prevent: stop (someone or something) from doing something or being in a certain state
keep out: prevent from entering; shut out

prevent (verb)	keep out (verb)
stop (someone or something) from doing something or being in a certain state	remain outside
keep from happening or arising; make impossible	prevent from entering; shut out