kiss has 5 distinct synonyms spread across 3 of its 6 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.
the act of caressing with the lips (or an instance thereof)
a cookie made of egg whites and sugar
Synonyms, antonyms and the broader and narrower relations for kiss come from Princeton University’s WordNet. Full sources and licences.
a light glancing touch
“there was a brief kiss of their hands in passing”
touch lightly or gently
“the blossoms were kissed by the soft rain”