ensemble vs jug band

ensemble and jug band both are nouns.

Word	Noun	Adjective	Verb	Adverb
ensemble	Yes	No	No	No
jug band	Yes	No	No	No

As nouns, jug band is a hyponym of ensemble; that is, jug band is a word with a more specific, narrower meaning than ensemble:

ensemble: a group of musicians playing or singing together
jug band: a musical group that uses jugs and washboards and kazoos and other improvised instruments

Other hyponyms of ensemble include gamelan, pop group, mariachi, skiffle group.

ensemble (noun)	jug band (noun)
a coordinated outfit (set of clothing)	a musical group that uses jugs and washboards and kazoos and other improvised instruments
the chorus of a ballet company
a group of musicians playing or singing together
an assemblage of parts or details (as in a work of art) considered as forming a whole
a cast other than the principals