inspector vs checker

inspector and checker both are nouns.

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

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

Other hyponyms of inspector include bank examiner, scrutiniser, scrutinizer, canvasser, scrutineer.

inspector (noun)	checker (noun)
an investigator who observes carefully	one of the flat round pieces used in playing the game of checkers
a high ranking police officer	one who checks the correctness of something
	an attendant who checks coats or baggage

inspector (verb)	checker (verb)
	variegate with different colors, shades, or patterns
	mark into squares or draw squares on; draw crossed lines on