Little Joe vs quartet

Little Joe and quartet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Little Joe	Yes	No	No	No
quartet	Yes	No	No	No

As nouns, Little Joe and quartet are synonyms defined as:

Little Joe and quartet: the cardinal number that is the sum of three and one

Other synonyms of Little Joe include 4, four, foursome, IV, quadruplet, quatern, quaternary, quaternion, quaternity, tetrad.

Little Joe (noun)	quartet (noun)
the cardinal number that is the sum of three and one	a musical composition for four performers
	four people considered as a unit
	a set of four similar things considered as a unit
	four performers or singers who perform together
	the cardinal number that is the sum of three and one