outsole

English Thesaurus

1. the outer sole of a shoe or boot that is the bottom of the shoe and makes contact with the ground (noun.artifact)

hypernym	:	sole,
definition	:	the underside of footwear or a golf club (noun.artifact)

part meronym	:	boot,
definition	:	footwear that covers the whole foot and lower leg (noun.artifact)

part meronym	:	shoe,
definition	:	footwear shaped to fit the foot (below the ankle) with a flexible upper of leather or plastic and a sole and heel of heavier material (noun.artifact)