poundage vs impoundment

poundage and impoundment both are nouns.

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

As nouns, poundage and impoundment are synonyms defined as:

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

Other synonyms of poundage include impounding, internment.

poundage (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
weight expressed in pounds
a fee charged for the recovery of impounded animals
a charge based on weight measured in pounds