gospel has 7 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.
the four books in the New Testament (Matthew, Mark, Luke, and John) that tell the story of Christ's life and teachings
folk music consisting of a genre of a cappella music originating with Black slaves in the United States and featuring call and response; influential on the development of other genres of popular music (especially soul)
the written body of teachings of a religious group that are generally accepted by that group
a doctrine that is believed to be of great importance
“Newton's writings were gospel for those who followed”
Synonyms, antonyms and the broader and narrower relations for gospel come from Princeton University’s WordNet. Full sources and licences.