Pretty much fandom wide ship (i.e. Rhack): Cargo Ship
Huge ship, but disliked by a lot (i.e. Gayperion): Yacht
Regular ship, mildly popular (i.e. Rhyiona): Ship (like the pirate kind)
Obscure Ships, have only a small amount of fans (i.e. Polyperion [Vaughn/Rhys/Yvette]): Boats (like canoes)
Microscopic ships, only shipped by like 10 people (i.e. Rhackothy [Jack/Rhys/Timothy]): Dingys
I am on the Rhackothy dingy along with ashestheterrible, somesketchyshit, and darktwinteeko. Join us so we can upgrade our status to boat.