Ok here we go, we’ll do this technically, without fancy adjectives :
Espresso : Very dark brown, very close to black but not just quite.
Rust : Dark brown, there may be a slight red tinge in the variation of our supply, but only slight.
Fox : Medium brown, with a slight red hue.
Sand : Tan, but not as light as typical tan, slightly darker and a bit yellower.
Red : A deep red.
Navy : A deep dark blue
Moss : A deep dark green
Teal : A bluish medium green.
In the project page, Moss and Teal might look similar on your screen, the easy way to remember it is that Moss is dark green-green while Teal is medium green-slight blue.