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"En" is a form of "en", a preposition which is often translated as "in". "Encima de" is a phrase which is often translated as "on". Learn more about the difference between "encima de" and "en" below.
encima de()
A phrase is a group of words commonly used together (e.g., once upon a time).
en()
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).