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QUICK ANSWER
"Cómo estás hoy" is a form of "cómo estás hoy", a phrase which is often translated as "how are you today". "Hola" is a form of "hola", an interjection which is often translated as "hello". Learn more about the difference between "cómo estás hoy" and "hola" below.
cómo estás hoy(
koh
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moh
ehs
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tahs
oy
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (informal) (in questions; second person singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
a. how are you today
Si anoche te acostaste tan tarde, ¿cómo estás hoy?If you went to bed so late last night, how are you today?
2. (informal) (in statements; second person singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
a. how you are today
Dime cómo estás hoy. ¿Te hicieron efecto las pastillas que te tomaste ayer?Tell me how you are today. Have you noticed the effect of the tablets you took yesterday?
hola
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
1. (general)
b. hi (colloquial)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
¡Hola! ¿Qué hay de nuevo?Hi! What's new?