paddy wagon vs police van

paddy wagon and police van both are nouns.

Word	Noun	Adjective	Verb	Adverb
paddy wagon	Yes	No	No	No
police van	Yes	No	No	No

As nouns, paddy wagon and police van are synonyms defined as:

Other synonyms of paddy wagon include black Maria, patrol wagon, police wagon, wagon.

paddy wagon (noun)	police van (noun)
van used by police to transport prisoners	van used by police to transport prisoners