restrain vs impound

restrain and impound both are verbs.

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

As verbs, impound is a hyponym of restrain; that is, impound is a word with a more specific, narrower meaning than restrain:

restrain: to close within bounds, or otherwise limit or deprive of free movement
impound: place or shut up in a pound

Other hyponyms of restrain include bind, tie down, tie up, truss, fetter, shackle, enchain, pinion, shackle, pound, pound, pound up, fold, pen up, ground.

restrain (verb)	impound (verb)
prevent the action or expression of	place or shut up in a pound
to close within bounds, or otherwise limit or deprive of free movement	take temporary possession of as a security, by legal authority
restrict (someone or something) so as to make free movement difficult
prevent (someone or something) from doing something