restrain vs prevent

restrain and prevent both are verbs.

Word	Noun	Adjective	Verb	Adverb
restrain	No	No	Yes	No
prevent	No	No	Yes	No

As verbs, prevent is a hypernym of restrain; that is, prevent is a word with a broader meaning than restrain:

restrain: prevent (someone or something) from doing something
prevent: stop (someone or something) from doing something or being in a certain state

Other hypernyms of restrain include keep.

restrain (verb)	prevent (verb)
prevent the action or expression of	stop (someone or something) from doing something or being in a certain state
to close within bounds, or otherwise limit or deprive of free movement	keep from happening or arising; make impossible
restrict (someone or something) so as to make free movement difficult
prevent (someone or something) from doing something