shank has 3 distinct synonyms spread across 3 of its 9 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the part of the human leg between the knee and the ankle
Synonyms, antonyms and the broader and narrower relations for shank come from Princeton University’s WordNet. Full sources and licences.
cylinder forming the part of a bolt between the thread and the head
cylinder forming the part of a bit by which it is held in the drill
a poor golf stroke in which the heel of the club hits the ball
hit (a golf ball) with the heel of a club, causing the ball to veer in the wrong direction