diamante vs sequin

diamante and sequin both are nouns.

Word	Noun	Adjective	Verb	Adverb
diamante	Yes	No	No	No
sequin	Yes	No	No	No

As nouns, diamante and sequin are synonyms defined as:

diamante and sequin: adornment consisting of a small piece of shiny material used to decorate clothing

Other synonyms of diamante include spangle.

diamante (noun)	sequin (noun)
adornment consisting of a small piece of shiny material used to decorate clothing	adornment consisting of a small piece of shiny material used to decorate clothing
fabric covered with glittering ornaments such as sequins or rhinestones