sports announcer vs sports commentator

sports announcer and sports commentator both are nouns.

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

As nouns, sports announcer and sports commentator are synonyms defined as:

sports announcer and sports commentator: an announcer who reads sports news or describes sporting events

Other synonyms of sports announcer include sportscaster.

sports announcer (noun)	sports commentator (noun)
an announcer who reads sports news or describes sporting events	an announcer who reads sports news or describes sporting events