blotter vs police blotter

blotter and police blotter both are nouns.

Word	Noun	Adjective	Verb	Adverb
blotter	Yes	No	No	No
police blotter	Yes	No	No	No

As nouns, blotter and police blotter are synonyms defined as:

blotter and police blotter: the daily written record of events (as arrests) in a police station

Other synonyms of blotter include charge sheet, day book, rap sheet.

blotter (noun)	police blotter (noun)
the daily written record of events (as arrests) in a police station	the daily written record of events (as arrests) in a police station
absorbent paper used to dry ink