As a lover of all things Mexican Food I feel I need to chime in here.
Burrito:
Flour tortilla rolled up with filling (meat, cheese, rice, beans, etc) Can be smothered or not. Sauce options would include red chili, chili verde, and Green chili.
* Now I know you are saying, "But Schemy chili verde and green chili are the same thing!" Oh, but they are not. Chili verde is made from tomatillos and is not that spicy. New Mexico/Colorado Green Chili (I say CO, because I grew up in SE CO and our Green Chili kicks the teeth out of any I ever had in NM) is made with green chilis, tomato, pork and is significantly spicier.
Fajita:
Grilled meats, peppers, onions. Served with pico de gaillo, creme, guac, and cheese if desired. Can add rice and beens if desired. Eaten like a taco.
Enchilada:
Filling rolled in a corn tortilla topped with a sauce. Traditional Red Sauce, Chili Verde, or Green Chili.
Tamale:
Masa dough wrapped in a corn husk (traditioinalist here) filled with choice of meats, cheese, vegetables. Steamed until cooked through. Can be served with salsa accompanyment or eaten plain. I like mine with pico.
Taco:
Meets eaten in a folded shell of either corn/flour tortilla served soft or crispy.
I'm sure I just stirred up the debate even more, but I likes me some mexican food.