sportscaster vs sports commentator

sportscaster and sports commentator both are nouns.

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

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

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

Other synonyms of sportscaster include sports announcer.

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