truck bed

English Thesaurus

1. the floor or bottom of a wagon or truck or trailer (noun.artifact)

hypernym	:	floor, flooring,
definition	:	the inside lower horizontal surface (as of a room, hallway, tent, or other structure) (noun.artifact)

hyponym	:	flatbed,
definition	:	an open truck bed or trailer with no sides; used to carry large heavy objects (noun.artifact)