Sentence:  <WSD>Liveaboards</WSD> come in all kinds of shapes and sizes: monohulls, catamarans, and trimarans, from less than 30 feet to over 100. A <WSD>liveaboard</WSD> serves as hotel, restaurant, and dive shop all in one — and sometimes even as a photoprocessing lab, too. 
Meaning of the word marked with <WSD> tags:  A boat designed or modified to allow people to live on board, compared to similar boats which do not have this feature.