Mexican-American vs Mexicano

Mexican-American and Mexicano both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mexican-American	Yes	No	No	No
Mexicano	Yes	No	No	No

As nouns, Mexican-American and Mexicano are synonyms defined as:

Mexican-American and Mexicano: a Mexican (or person of Mexican descent) living in the United States

Mexican-American (noun)	Mexicano (noun)
a Mexican (or person of Mexican descent) living in the United States	a Mexican (or person of Mexican descent) living in the United States