Sentence:  “Hrrumph,” said the Mate. “Get into uniform right away, we must have discipline here.” With that he stalked off as if he were First Mate on one of the Queens instead of just on a dirty, rusty old <WSD>tramp</WSD> ship. 
Meaning of the word marked with <WSD> tags:  Any ship which does not have a fixed schedule or published ports of call.