sports coat vs sport coat

sports coat and sport coat both are nouns.

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

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

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

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

sports coat (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