They all have 3 letters, but "red" and "tan" have exactly 3 letters.
Red
Tan
red, tan
The three primary colors are Red, Blue, and Green.You can remember them easily when you remember Roy G Biv. The capitalized letters are the three Primary Colors.
None of the Scandinavian countries have a name with only three letters.
I can find 4. Red, Tan, Hay and Dun. Not fully sure if Dun is a color
Orange, purple, yellow.
Hue is another word for colour.
The flower with only three letters in its name is the "lily."
There are two types of whales that have only three letters in their name. The Fin whale and the Sei whale.
The first three letters are JON. The last three letters are NES.
Ant
Hart
The name of a snow runner with three letters could be ski.