vs
QUICK ANSWER
"But also" is a conjunction which is often translated as "pero también", and "as well as" is a phrase which is often translated as "además de". Learn more about the difference between "but also" and "as well as" below.
but also()
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
a. pero también
What a tough choice! I like bacon, but also sausage.¡Qué decisión tan difícil! Me gusta el tocino, pero también la salchicha.
2. (rather)
a. sino también
Come have dinner with us. And not only you, but also your family.Ven a cenar con nosotros. Y no solo tú, sino también tu familia.
as well as()
A phrase is a group of words commonly used together (e.g., once upon a time).
a. tan bien como
I could never play soccer as well as my brother can.Nunca pude jugar al fútbol tan bien como puede mi hermano.