fake has 31 distinct synonyms spread across 8 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.
something that is a counterfeit; not what it seems to be
make a copy of with the intent to deceive
“he faked the signature”
Synonyms, antonyms and the broader and narrower relations for fake come from Princeton University’s WordNet. Full sources and licences.
speak insincerely or without regard for facts or truths
“The politician was not well prepared for the debate and faked it”