impounding vs impoundment

impounding and impoundment both are nouns.

Word	Noun	Adjective	Verb	Adverb
impounding	Yes	No	No	No
impoundment	Yes	No	No	No

As nouns, impounding and impoundment are synonyms defined as:

impounding and impoundment: placing private property in the custody of an officer of the law

Other synonyms of impounding include internment, poundage.

impounding (noun)	impoundment (noun)
placing private property in the custody of an officer of the law	placing private property in the custody of an officer of the law