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"Hoy" is an adverb which is often translated as "today", and "día" is a noun which is often translated as "day". Learn more about the difference between "hoy" and "día" below.
hoy(
oy
)An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
2. (nowadays)
el día(
dee
-
ah
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. day
Estoy en el restaurante en donde comimos el otro día.I'm at the restaurant where we ate the other day.
2. (daylight)
a. day
Los que trabajan en el turno de noche tienen que dormir de día.Night workers have to sleep during the day.