Barge (4)
'barge' is the definition.
(synonyms)
This is all the clue.
(Other definitions for lighter that I've seen before include "less tonnage" , "Goods barge" , "More manageable" , "Flat-bottomed barge - not so heavy" , "carrying less cargo?" .)
'barge' is the definition.
(both are a type of boat)
This is the entire clue.
(Other definitions for keel that I've seen before include "Coal-carrying vessel" , "Low part of ship" , "ridge" , "Lengthwise structure of a ship" , "Bottom of boat" .)
'barge' is the definition.
(scow is a kind of barge)
This is all the clue.
(Other definitions for scow that I've seen before include "Unpowered freight barge" , "Low boat" , "Wide-beamed dinghy" , "ighter" , "Maybe lighter" .)
'barge' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for raft that I've seen before include "Flat buoyant structure used as a boat" , "Floating mass of logs" , "great deal" , "Wooden craft" , "Floating platform of logs, planks, etc" .)