submission has 3 distinct synonyms spread across 3 of its 7 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 act of submitting; usually surrendering power to another
the condition of having submitted to control by someone or something else
“the union was brought into submission”
a legal document summarizing an agreement between parties in a dispute to abide by the decision of an arbiter
an agreement between parties in a dispute to abide by the decision of an arbiter
(law) a contention presented by a lawyer to a judge or jury as part of the case he is arguing
Synonyms, antonyms and the broader and narrower relations for submission come from Princeton University’s WordNet. Full sources and licences.