leg has 6 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.
a human limb; commonly used to refer to a whole limb but technically only the part of the limb between the knee and ankle
a structure in animals that is similar to a human leg and used for locomotion
Synonyms, antonyms and the broader and narrower relations for leg come from Princeton University’s WordNet. Full sources and licences.
one of the supports for a piece of furniture
a part of a forked or branching shape
“he broke off one of the branches”
the limb of an animal used for food
a cloth covering consisting of the part of a pair of trousers that covers a person's leg
(nautical) the distance traveled by a sailing vessel on a single tack
a section or portion of a journey or course
“then we embarked on the second stage of our Caribbean cruise”