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"Por fin" is a phrase which is often translated as "finally", and "a casa" is an adverb which is often translated as "home". Learn more about the difference between "por fin" and "a casa" below.
por fin(
pohr
 
feen
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. finally
Por fin encontré las llaves del coche. Estaban en mi bolsillo.I finally found my car keys. They were in my pocket.
b. at last
¡Por fin he terminado de escribir mi autobiografía de 800 páginas!At last I have finished writing my 800-page autobiography!
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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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