Traditionally, chiles rellenos are made with poblano peppers, large evergreen-colored specimens that are native to the place where these ”stuffed chiles” originated: Puebla, Mexico. “Poblano” is actually a term for inhabitants of this city.
Enchilada is the past participle of the Spanish verb enchilar, “to season with chile.” In its more authentic form on the streets of Mexico, an enchilada is simply a tortilla dipped in chile sauce, often without any filling.
Sure, they’re a pretty standard fixture in American cuisine, but tacos are a) delicious, b) about as authentically Mexican as it gets, and c) one of the few easily-made-vegetarian dishes from south of the border.