This is the 16642nd most frequent Russian word.
серебристый
Silvery.
The word 'серебристая' is used as an adjective describing the car, denoting its color which resembles silver.
Серебристая машина была заметна на дороге.
The silvery car was noticeable on the road.
Here 'серебристыми' is an adjective in the instrumental plural form, used to describe the appearance of hair under sunlight.
Её волосы казались серебристыми на солнце.
Her hair appeared silvery in the sunlight.
The adjective 'серебристый' is used as a noun describing the shade chosen for the room's decoration.