detective vs investigator

detective and investigator both are nouns.

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

As nouns, detective and investigator are synonyms defined as:

Other synonyms of detective include police detective, tec.

As nouns, investigator is a hypernym of detective; that is, investigator is a word with a broader meaning than detective:

detective: an investigator engaged or employed in obtaining information not easily available to the public
investigator: someone who investigates

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