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QUICK ANSWER
"Año" is a form of "año", a noun which is often translated as "year". "Dentro de" is a preposition which is often translated as "inside". Learn more about the difference between "dentro de" and "año" below.
dentro de()
A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).
2. (time limit)
el año()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
2. (of school)
a. grade
Si fallo el examen, tendré que repetir el año.If I fail this test, I will have to repeat the grade.
