taco vs greaser

taco and greaser both are nouns.

Word	Noun	Adjective	Verb	Adverb
taco	Yes	No	No	No
greaser	Yes	No	No	No

As nouns, taco and greaser are synonyms defined as:

taco and greaser: (ethnic slur) offensive term for a person of Mexican descent

Other synonyms of taco include wetback.

taco (noun)	greaser (noun)
a tortilla rolled cupped around a filling	(ethnic slur) offensive term for a person of Mexican descent
(ethnic slur) offensive term for a person of Mexican descent