tobacco (from tabaco, a word possibly of Caribbean origin)
taco (In Spanish, a taco can refer to a stopper, plug or wad. In other words, a taco originally meant a wad of food. Indeed, in Mexico, the variety of tacos is almost endless, far more varied than the beef, lettuce and cheese combination of U.S.-style fast food.)
tamale (The Spanish singular for this Mexican dish is tamal. The English comes from an erroneous backformation of the Spanish plural, tamales.)
tamarillo (type of tree, derived from tomatillo, a small tomato)
tango
tequila (named after a Mexican town of the same name)
tejano (type of music)
tomatillo
tomato (from tomate, derived from Nahuatl tomatl)
toreador
tornado (from tronada, thunderstorm)
tortilla (in Spanish, an omelet often is a tortilla)
tuna (from atún)
vamoose (from vamos, a form of "to go")
vanilla (from vainilla)
vaquero (English regionalism for a cowboy)
vicuña (animal similar to a llama, from Quechua wikuña)
vigilante (from adjective for "vigilant")
vinegarroon (from vinagrón)
wrangler (some sources say word is derived from Mexican Spanish caballerango, one who grooms horses, while other sources say the word comes from German)
yucca (from yuca, originally a Caribbean word)
zapateado (a type of dance emphasizing movement of the heels)