checker vs examiner

checker and examiner both are nouns.

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

As nouns, examiner is a hypernym of checker; that is, examiner is a word with a broader meaning than checker:

Other hypernyms of checker include inspector.

checker (noun)	examiner (noun)
one of the flat round pieces used in playing the game of checkers	an investigator who observes carefully
one who checks the correctness of something	someone who administers a test to determine your qualifications
an attendant who checks coats or baggage

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