life raft vs scull

life raft

noun
  • A usually inflatable raft carried aboard a ship or airplane, used to save lives in case the vessel has to be abandoned in an emergency on the sea. 

scull

noun
  • A small rowing boat, for one person. 

  • A skull cap. A small bowl-shaped helmet, without visor or bever. 

  • One of a pair of oars handled by a single rower. 

  • A light rowing boat used for racing by one, two, or four rowers, each operating two oars (sculls), one in each hand. 

  • The skua gull. 

  • A single oar mounted at the stern of a boat and moved from side to side to propel the boat forward. 

verb
  • To drink the entire contents of (a drinking vessel) without pausing. 

  • To row a boat using a scull or sculls. 

  • To skate while keeping both feet in contact with the ground or ice. 

How often have the words life raft and scull occurred in a corpus of books? (source: Google Ngram Viewer )