This is the 1039th most frequent German word.
red
The German word "red" does not exist as such; you likely mean "reden," which means "to talk" or "to speak" in English.
In this sentence, 'rote' is used as an adjective to describe the noun 'Blume,' utilizing its agreement with the feminine singular noun in German.
Die rote Blume ist sehr schön.
The red flower is very beautiful.
Here, 'rot' functions as a predicate adjective in combination with the verb 'zeigt,' describing the state of the traffic light.
Die Ampel zeigt rot.
The traffic light shows red.
In this example, 'Rot' is used as a noun representing the color red itself, showing its flexibility as both an adjective and noun.