sport coat vs sport jacket

sport coat and sport jacket both are nouns.

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

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

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

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

sport coat (noun)	sport jacket (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