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"Años" is a form of "año", a noun which is often translated as "year". "Horas" is a form of "hora", a noun which is often translated as "hour". Learn more about the difference between "años" and "horas" below.
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.
la hora()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
a. time
Es hora de que se reúnan y tomen una decisión.It is time for them to meet and make a decision.
5. (meeting)
a. appointment
Mañana tengo hora con el podólogo.I have an appointment with the podiatrist tomorrow.