sports jacket vs sport coat

sports jacket and sport coat both are nouns.

Word	Noun	Adjective	Verb	Adverb
sports jacket	Yes	No	No	No
sport coat	Yes	No	No	No

As nouns, sports jacket and sport coat are synonyms defined as:

sports jacket and sport coat: lightweight single-breasted jacket; often striped in the colors of a club or school

Other synonyms of sports jacket include blazer, sport jacket, sports coat.

sports jacket (noun)	sport coat (noun)
lightweight single-breasted jacket; often striped in the colors of a club or school	lightweight single-breasted jacket; often striped in the colors of a club or school