joint has 11 distinct synonyms spread across 5 of its 13 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. Its one recorded opposite is separate.
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.
(anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion)
the shape or manner in which things come together and a connection is made
a piece of meat roasted or for roasting and of a size for slicing into more than one portion
junction by which parts or objects are joined together
marijuana leaves rolled into a cigarette for smoking
fit as if by joints
“The boards fit neatly”
provide with a joint
“the carpenter jointed two pieces of wood”
united or combined
“a joint session of Congress”
2 of the 13 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for joint.
Synonyms, antonyms and the broader and narrower relations for joint come from Princeton University’s WordNet. Full sources and licences.