This is the 496th most frequent Persian word.
قرمز
Red.
In this context, 'قرمز' implies the attribute (color) of the card, which is associated with a symbolic meaning.
این کارت قرمز نشان دهندهٔ اخطار است.
This red card represents a warning.
In this sentence, 'قرمز' describes the color of an object (shirt).
پیرهن او قرمز است.
Her shirt is red.
Here, 'قرمز' refers to the specific characteristic (color) of the mentioned circle.