Flatboat and Life raft

Flatboat noun - A flatbottom boat for carrying heavy loads (especially on canals).

Life raft and flatboat are semantically related. In some cases you can use "Life raft" instead a noun "Flatboat".

Life raft noun - A raft to use if a ship must be abandoned in an emergency.

Flatboat and life raft are semantically related. You can use "Flatboat" instead a noun phrase "Life raft".