sports announcer vs sportscaster

sports announcer and sportscaster both are nouns.

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

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

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

Other synonyms of sports announcer include sports commentator.

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