duo vs duet

duo and duet both are nouns.

Word	Noun	Adjective	Verb	Adverb
duo	Yes	No	No	No
duet	Yes	No	No	No

As nouns, duo and duet are synonyms defined as:

Other synonyms of duo include duette.

As nouns, duo and duet are synonyms defined as:

Other synonyms of duo include couple, twosome.

As nouns, duo and duet are synonyms defined as:

Other synonyms of duo include duette.

As nouns, duo and duet are synonyms defined as:

Other synonyms of duo include brace, couple, couplet, distich, duad, dyad, pair, span, twain, twosome, yoke.

duo (noun)	duet (noun)
a musical composition for two performers	(ballet) a dance for two people (usually a ballerina and a danseur noble)
a pair who associate with one another	a musical composition for two performers
two performers or singers who perform together	a pair who associate with one another
two items of the same kind	two performers or singers who perform together
	two items of the same kind