confiscate vs impound

confiscate is an adjective but impound is not an adjective.

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

As verbs, confiscate and impound are synonyms defined as:

confiscate and impound: take temporary possession of as a security, by legal authority

Other synonyms of confiscate include attach, seize, sequester.

confiscate (adjective)	impound (adjective)
surrendered as a penalty

confiscate (verb)	impound (verb)
take temporary possession of as a security, by legal authority	place or shut up in a pound
	take temporary possession of as a security, by legal authority