abomination has 5 distinct synonyms spread across 1 of its 3 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 person who is loathsome or disgusting
hate coupled with disgust
Synonyms, antonyms and the broader and narrower relations for abomination come from Princeton University’s WordNet. Full sources and licences.
an action that is vicious or vile; an action that arouses disgust or abhorrence
“his treatment of the children is an abomination”