investigator vs officer

investigator and officer both are nouns.

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

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

Other hypernyms of investigator include police officer.

investigator (noun)	officer (noun)
someone who investigates	a member of a police force
a scientist who devotes himself to doing research	someone who is appointed or elected to an office and who holds a position of trust
a police officer who investigates crimes	any person in the armed services who holds a position of authority or command
	a person authorized to serve in a position of authority on a vessel

investigator (verb)	officer (verb)
	direct or command as an officer