gravity has 9 distinct synonyms spread across 3 of its 3 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 levity.
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.
(physics) the force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface
“the more remote the body the less the gravity”
a manner that is serious and solemn
a solemn and dignified feeling
Synonyms, antonyms and the broader and narrower relations for gravity come from Princeton University’s WordNet. Full sources and licences.