police wagon vs patrol wagon

police wagon and patrol wagon both are nouns.

Word	Noun	Adjective	Verb	Adverb
police wagon	Yes	No	No	No
patrol wagon	Yes	No	No	No

As nouns, police wagon and patrol wagon are synonyms defined as:

police wagon and patrol wagon: van used by police to transport prisoners

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

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