transposition has 6 distinct synonyms spread across 3 of its 7 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.
an event in which one thing is substituted for another
“the replacement of lost blood by a transfusion of donor blood”
(genetics) a kind of mutation in which a chromosomal segment is transfered to a new position on the same or another chromosome
(mathematics) the transfer of a quantity from one side of an equation to the other along with a change of sign
(electricity) a rearrangement of the relative positions of power lines in order to minimize the effects of mutual capacitance and inductance
“he wrote a textbook on the electrical effects of transposition”
(music) playing in a different key from the key intended; moving the pitch of a piece of music upwards or downwards
Synonyms, antonyms and the broader and narrower relations for transposition come from Princeton University’s WordNet. Full sources and licences.