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QUICK ANSWER
"Why not" is a form of "why not", a phrase which is often translated as "por qué no". "Because" is a conjunction which is often translated as "porque". Learn more about the difference between "because" and "why not" below.
because(
bi
-
kuhz
)A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
why not(
way
nat
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. por qué no
Why are you studying on a Friday night? Why not do something fun?¿Por qué estás estudiando el viernes por la noche? ¿Por qué no haces algo divertido?