Gray feather with red tip, about 5 cm (2 in) total length. It was found in Lexington, Kentucky (central western USA).
Cedar waxwing. Source: https://rctfan2.deviantart.com/art/Cedar-Waxwing-285656802
Actually, that red tip gives the bird its name (from the Wikipedia link):
They have unique red tips to some of the wing feathers where the shafts extend beyond the barbs; in the Bohemian and Cedar waxwings, these tips look like sealing wax, and give the group its common name.
Therefore, the possible species are the Bohemian waxwing (B. garrulus)...
... and the Cedar waxwing (B. cedrorum):
However, since the secondaries of B. garrulus normally have a white area next to the tip...
... I'd guess that your feather belongs to B. cedrorum.
Besides the white patches in the feathers of Bohemian waxwings, OP just confirmed that the range of the Bohemian waxwing doesn't match. Therefore, this feather belongs indeed to a Cedar waxwing.