Wheaten vs Whetten - What's the difference?

As an adjective wheaten

is of, pertaining to, or made from wheat.

is a pale yellow or beige colour, like that of wheat.

(rare) to whet.

(en adjective)

Of, pertaining to, or made from wheat.

Of a pale yellow-beige colour, like that of wheat.

* wheaten terrier

(-)

A pale yellow or beige colour, like that of wheat.

(en verb)

(rare) To whet.