blazer vs sport jacket

blazer and sport jacket both are nouns.

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

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

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

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

blazer (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