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"Hora" is a noun which is often translated as "hour", and "cuarenta" is an adjective which is often translated as "forty". Learn more about the difference between "hora" and "cuarenta" below.
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.
cuarenta()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).