ensemble vs mariachi

ensemble and mariachi both are nouns.

Word	Noun	Adjective	Verb	Adverb
ensemble	Yes	No	No	No
mariachi	Yes	No	No	No

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

Other hyponyms of ensemble include gamelan, jug band, pop group, skiffle group.

ensemble (noun)	mariachi (noun)
a coordinated outfit (set of clothing)	a group of street musicians in Mexico
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