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"Las ventanas" is a form of "ventana", a noun which is often translated as "window". "Ellas" is a pronoun which is often translated as "they". Learn more about the difference between "ellas" and "las ventanas" below.
ellas(
eh
-
yahs
)A pronoun is a word that stands in for a noun (e.g., she).
b. them (object; after preposition)
Me refería a ellas, las que están sentadas allá.I was referring to them, the ones sitting over there.
Díselo a ellas.Tell it to them.
la ventana(
behn
-
tah
-
nah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
b. window frame
Tenemos que volver a pintar las ventanas antes de que vengan los nuevos inquilinos.We have to paint the window frames again before the new tenants come.
a. nostril
"Tengo tapada la ventana derecha," le dijo al doctor."My right nostril is blocked," he told the doctor.
3. (computing)
a. window
A lo mejor está lenta tu computadora porque tienes tantas ventanas abiertas.Maybe your computer is slow because you have so many windows open.