This is the 510th most frequent Dutch word.
witte
"Witte" means "white" in English.
Here, "witte" is an attributive adjective indicating the color of the noun "kat" (cat), agreeing in form with the definite article "de" and the common-gender noun.
De witte kat zit op het dak.
The white cat is sitting on the roof.
"Witte" is an adjective describing the attribute of the noun "auto" (car), showing concord with the indefinite article "een" and taking the -e ending often used in such constructions in Dutch.
Hij wil altijd een witte auto kopen.
He always wants to buy a white car.
The word "witte" serves as an attributive adjective describing "muren" (walls), following the rules of agreement with plural and definite articles in Dutch.