impoundment vs impounding

impoundment and impounding both are nouns.

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

As nouns, impoundment and impounding are synonyms defined as:

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

Other synonyms of impoundment include internment, poundage.

impoundment (noun)	impounding (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