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QUICK ANSWER
"Why" is a form of "why", an adverb which is often translated as "por qué". "There is not" is a phrase which is often translated as "no hay". Learn more about the difference between "there is not" and "why" below.
there is not(
thehr
 
ihz
 
nat
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. no hay
There is not a doubt in my mind that Manuel is guilty of fraud.No hay duda en mi mente que Manuel es culpable de fraude.
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why(
way
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. por qué
Why are you crying?¿Por qué lloras?
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
conjunction
a. por qué
I don't know why she left me.No sé por qué me dejó.
A noun is a word referring to a person, animal, place, thing, feeling, or idea (e.g., man, dog, house).
noun
a. el porqué
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(M)
Do you really want to know why?¿De verdad quieres saber el porqué?
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. vaya
Why! Look who just arrived!¡Vaya! ¡Mira quién acaba de llegar!
b. anda
Why, surely you don't think Anna stole your ring!Anda, ¡no pensarás que Anna te robó el anillo!
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