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maintenance 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.
activity involved in maintaining something in good working order
“he wrote the manual on car care”
means of maintenance of a family or group
court-ordered support paid by one spouse to another after they are separated
the act of sustaining life by food or providing a means of subsistence
“they were in want of sustenance”
the unauthorized interference in a legal action by a person having no interest in it (as by helping one party with money or otherwise to continue the action) so as to obstruct justice or promote unnecessary litigation or unsettle the peace of the community
“unlike champerty, criminal maintenance does not necessarily involve personal profit”
Synonyms, antonyms and the broader and narrower relations for maintenance come from Princeton University’s WordNet. Full sources and licences.