vs
QUICK ANSWER
"Febrero" is a noun which is often translated as "February", and "diciembre" is a noun which is often translated as "December". Learn more about the difference between "febrero" and "diciembre" below.
el febrero()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
el diciembre()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).