Literary References
This was my first thought because of 'Cutter' (as in *Cutter and Bone* or *Catcher in the Rye*) and the famous 'Ark' from Noah's story. The theme seemed solid for two clues. However, 'Ferry' and 'Canoe' don't have a strong, unique literary connection, and 'Catamaran' has almost none, so the theme breaks on at least three of the five clues.