restrain vs constrain

restrain and constrain both are verbs.

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

As verbs, restrain and constrain are synonyms defined as:

restrain and constrain: to close within bounds, or otherwise limit or deprive of free movement

Other synonyms of restrain include confine, hold.

restrain (verb)	constrain (verb)
prevent the action or expression of	severely restrict in scope or extent
to close within bounds, or otherwise limit or deprive of free movement	to close within bounds, or otherwise limit or deprive of free movement
restrict (someone or something) so as to make free movement difficult	compel to behave in a certain way
prevent (someone or something) from doing something