sports commentator vs announcer

sports commentator and announcer both are nouns.

Word	Noun	Adjective	Verb	Adverb
sports commentator	Yes	No	No	No
announcer	Yes	No	No	No

As nouns, announcer is a hypernym of sports commentator; that is, announcer is a word with a broader meaning than sports commentator:

sports commentator: an announcer who reads sports news or describes sporting events
announcer: reads news, commercials on radio or television

sports commentator (noun)	announcer (noun)
an announcer who reads sports news or describes sporting events	reads news, commercials on radio or television
	someone who proclaims a message publicly