I would imagine all tequilla is 100% tequilla. I think a better question would be which brands of tequilla are made from 100% Agave. Typically the cheaper tequillas (7.5 ml bottles cheaper than $20) are made with higher concentrations of sugar and not 100% Agave.
The Spanish word for "spell" (as in letters in a word) is "deletrear" Which translated lyerally means to separate the letters. The word for "spell" (as in time) is "temporada". The word for "spell" (as in hex) is "encanto".