hip has 10 distinct synonyms spread across 4 of its 6 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.
either side of the body below the waist and above the thigh
the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates
the ball-and-socket joint between the head of the femur and the acetabulum
(architecture) the exterior angle formed by the junction of a sloping side and a sloping end of a roof
Synonyms, antonyms and the broader and narrower relations for hip come from Princeton University’s WordNet. Full sources and licences.