motion has 8 distinct synonyms spread across 7 of its 8 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 motionlessness.
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 use of movements (especially of the hands) to communicate familiar or prearranged signals
a natural event that involves a change in the position or location of something
a state of change
“they were in a state of steady motion”
an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object
“the cinema relies on apparent motion”
show, express or direct through movement
“He gestured his desire to leave”
Synonyms, antonyms and the broader and narrower relations for motion come from Princeton University’s WordNet. Full sources and licences.