Kayak or catamaran (4)
I believe the answer is:
boat
I believe this is a double definition.
'kayak' is the first definition.
(thesaurus)
'catamaran' is the second definition.
(thesaurus)
(Other definitions for boat that I've seen before include "Vessel for water travel" , "Small vessel" , "Contest on the Thames" , "Floating vessel" , "cat, for example" .)