tout has 12 distinct synonyms spread across 4 of its 5 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.
someone who buys tickets to an event in order to resell them at a profit
someone who advertises for customers in an especially brazen way
one who sells advice about gambling or speculation (especially at the racetrack)
advertize in strongly positive terms
“This product was touted as a revolutionary invention”
Synonyms, antonyms and the broader and narrower relations for tout come from Princeton University’s WordNet. Full sources and licences.