officer vs inspector

officer and inspector both are nouns.

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

As nouns, inspector is a hyponym of officer; that is, inspector is a word with a more specific, narrower meaning than officer:

officer (noun)	inspector (noun)
a member of a police force	an investigator who observes carefully
someone who is appointed or elected to an office and who holds a position of trust	a high ranking police officer
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

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