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"A casa" is an adverb which is often translated as "home", and "en casa" is a phrase which is often translated as "at home". Learn more about the difference between "a casa" and "en casa" below.
a casa(
ah
 
kah
-
sah
)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
adverb
a. home
Me voy a casa. ¿Quieres que te dé un aventón?I'm going home. Do you want me to give you a ride?
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en casa(
ehn
 
kah
-
sah
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. at home
Estaba en casa viendo tele cuando llamó.I was at home watching TV when he called.
b. home
Ya estoy en casa.I'm home already.
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