"Why not" is a phrase which is often translated as "por qué no", and "why" is an adverb which is often translated as "por qué". Learn more about the difference between "why not" and "why" below.
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An adverb is a word that describes a verb, an adjective, or other adverbs (e.g. to run quickly, very tired).
1. (in questions)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
2. (in relative clauses)
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).