A cutter may have more than one headsail, and a ketch, yawl or schooner may have more than one sail on a boom.
en.wikipedia.org The purpose of the mizzen sail in a ketch rig, unlike the mizzen on a yawl rig, is to provide drive to the hull.
en.wikipedia.org Next, a small metallic dingy, known as an iron yawl, was carried down to the beach.
en.wikipedia.org The ships carried a number of smaller boats, including three picket boats, one launch, one pinnace, two cutters, two yawls, and three dinghies.
en.wikipedia.org Early boats were developed from single-masted cutters and twin-masted yawls, and later into the specialist pilot cutter.
en.wikipedia.org