Definitions of raft:

• noun:   a flat float (usually made of logs or planks) that can be used for transport or as a platform for swimmers
• noun:   (often followed by `of') a large number or amount or extent
• verb:   make into a raft

  Example: "Raft these logs"

• verb:   travel by raft in water

  Example: "Raft the Colorado River"

• verb:   transport on a raft

  Example: "Raft wood down a river"