vs
QUICK ANSWER
"El fax" is a form of "fax", a noun which is often translated as "fax". "La impresora" is a form of "impresora", a noun which is often translated as "printer". Learn more about the difference between "el fax" and "la impresora" below.
el fax()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
1. (message)
la impresora()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).