seizure vs impounding

seizure and impounding both are nouns.

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

As nouns, impounding is a hyponym of seizure; that is, impounding is a word with a more specific, narrower meaning than seizure:

seizure: the taking possession of something by legal process
impounding: placing private property in the custody of an officer of the law

seizure (noun)	impounding (noun)
the taking possession of something by legal process	placing private property in the custody of an officer of the law
the act of forcibly dispossessing an owner of property
the act of taking of a person by force
a sudden occurrence (or recurrence) of a disease