tuxedo vs dinner jacket

tuxedo and dinner jacket both are nouns.

Word	Noun	Adjective	Verb	Adverb
tuxedo	Yes	No	No	No
dinner jacket	Yes	No	No	No

As nouns, tuxedo and dinner jacket are synonyms defined as:

Other synonyms of tuxedo include black tie, tux.

tuxedo (noun)	dinner jacket (noun)
semiformal evening dress for men	semiformal evening dress for men