vs
QUICK ANSWER
"Martes" is a noun which is often translated as "Tuesday", and "lunes" is a noun which is often translated as "Monday". Learn more about the difference between "martes" and "lunes" below.
el martes(
mahr
-
tehs
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
el lunes(
loo
-
nehs
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).