tilt has 23 distinct synonyms spread across 7 of its 9 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.
a contentious speech act; a dispute where there is strong disagreement
“they were involved in a violent argument”
a slight but noticeable partiality
“the court's tilt toward conservative rulings”
the property possessed by a line or surface that departs from the vertical
“the tower had a pronounced tilt”
Synonyms, antonyms and the broader and narrower relations for tilt come from Princeton University’s WordNet. Full sources and licences.