grace has 17 distinct synonyms spread across 9 of its 10 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.
(Christian theology) a state of sanctification by God; the state of one who is under such divine influence
“the conception of grace developed alongside the conception of sin”
elegance and beauty of movement or expression
“a beautiful figure which she used in subtle movements of unparalleled grace”
a sense of propriety and consideration for others
“a place where the company of others must be accepted with good grace”
a disposition to kindness and compassion
“the victor's grace in treating the vanquished”
a period of time past the deadline for fulfilling an obligation during which a penalty that would be imposed for being late is waived, especially an extended period granted as a special favor
“The payment had originally been due on April 1 but we had a grace period which expired in June.”
(Greek mythology) one of three sisters who were the givers of beauty and charm; a favorite subject for sculptors
a short prayer of thanks before a meal
“their youngest son said grace”
(Christian theology) the free and unmerited favor or beneficence of God
“God's grace is manifested in the salvation of sinners”
Synonyms, antonyms and the broader and narrower relations for grace come from Princeton University’s WordNet. Full sources and licences.