appeal has 9 distinct synonyms spread across 6 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.
Synonyms, antonyms and the broader and narrower relations for appeal come from Princeton University’s WordNet. Full sources and licences.
attractiveness that interests or pleases or stimulates
“his smile was part of his appeal to her”
(law) a legal proceeding in which the appellant resorts to a higher court for the purpose of obtaining a review of a lower court decision and a reversal of the lower court's judgment or the granting of a new trial
“their appeal was denied in the superior court”
request for a sum of money
“an appeal to raise money for starving children”