mariachi vs ensemble

mariachi and ensemble both are nouns.

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

As nouns, ensemble is a hypernym of mariachi; that is, ensemble is a word with a broader meaning than mariachi:

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