Prince is better than warrior, War-prince is better than prince, Captain is better than war-prince.
A captain has a space-ship, with war-princes and princes and warriors under his control. War-princes are old princes who did great things, princes are warriors who did great things...
A captain is a little like a visser, to me. The War-Princes and princes like the sub-vissers and some low vissers...
Well, at least, it's what I understood.