detective vs police detective

detective and police detective both are nouns.

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

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

detective and police detective: a police officer who investigates crimes

Other synonyms of detective include investigator, tec.

detective (noun)	police detective (noun)
a police officer who investigates crimes	a police officer who investigates crimes
an investigator engaged or employed in obtaining information not easily available to the public