subservience has 3 distinct synonyms spread across 2 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.
the condition of being something that is useful in reaching an end or carrying out a plan
“all his actions were in subservience to the general plan”
abject or cringing submissiveness
Synonyms, antonyms and the broader and narrower relations for subservience come from Princeton University’s WordNet. Full sources and licences.