Cushion
A solid low, moderately small comb; smooth on top, the front, rear and sides are nearly straight with rounded corners. It has no spikes.
Rose
A broad comb, nearly flat on top, covered with regular points, and finished with a spike or leader. It varies in length, width, and carriage according to breed.
Walnut
A comb that resembles one half of a walnut meat in appearance.
Raspberry
A comb somewhat resembling a raspberry cut through its axis (lengthwise) and covered with small protuberances.
Strawberry
A low comb that is set well-forward. The shape and surface resemble the outer part of half a strawberry, with the large end nearest the beak of the chicken.
Chris