vs 

QUICK ANSWER
"Hi" is a form of "hi", an interjection which is often translated as "hola". "How are you doing?" is a phrase which is often translated as "¿Cómo estás?". Learn more about the difference between "How are you doing?" and "hi" below.
How are you doing?(
hau
 
ar
 
yu
 
du
-
ihng
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
1.
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(used to address one person)
a. ¿Cómo estás?
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(singular)
How are you doing? - Fine, thanks.¿Cómo estás? - Bien, gracias.
b. ¿Cómo te va?
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
(informal)
(singular)
How are you doing? I hope that everything is well with you and your family.¿Cómo te va? Espero que las cosas les vayan bien a ti y a tu familia.
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hi(
hay
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
1.
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
(colloquial)
(salutation)
a. hola
Hi! Long time no see!¡Hola! ¡Hacía mucho que no nos veíamos!
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