Boat, craft (6)
I believe the answer is:
vessel
I believe this is a double definition.
'boat' is the first definition.
(boat is a type of vessel)
'craft' is the second definition.
(I know that craft can be written as vessel)
(Other definitions for vessel that I've seen before include "Watercraft or water container" , "Boat or bottle, say" , "A ship, a cup" , "Decide on or establish" , "Craft for water transportation" .)