vs 

QUICK ANSWER
"Hello" is a form of "hello", an interjection which is often translated as "hola". "Why" is a form of "why", an adverb which is often translated as "por qué". Learn more about the difference between "hello" and "why" below.
hello(
heh
-
lo
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. hola
Hello! How is everything?¡Hola! ¿Cómo te va todo?
a.
Hello. Who is calling?Sí. ¿Quién es?
b. hola
Hello. - Hi, it's Ricardo.Hola. - Hola, soy Ricardo.
c. diga
Regionalism used in Spain
(Spain)
Hello. - Hi. Is Maria there?Diga. - Hola. ¿Se encuentra María?
d. aló
Regionalism used in Ecuador
(Ecuador)
Regionalism used in Panama
(Panama)
(Southern Cone)
Hello. Who is this?Aló. ¿Quién es?
e. bueno
Regionalism used in Mexico
(Mexico)
Hello? I can't hear you.¿Bueno? No te escucho.
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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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