foil has 11 distinct synonyms spread across 4 of its 8 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 piece of thin and flexible sheet metal
“the photographic film was wrapped in foil”
picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector
a light slender flexible sword tipped by a button
enhance by contrast
“In this picture, the figures are foiled against the background”
Synonyms, antonyms and the broader and narrower relations for foil come from Princeton University’s WordNet. Full sources and licences.