sport coat vs blazer

sport coat and blazer both are nouns.

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

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

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

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

sport coat (noun)	blazer (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