employment has 8 distinct synonyms spread across 4 of its 4 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. Its one recorded opposite is unemployment.
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 state of being employed or having a job
“they are looking for employment”
the act of giving someone a job
Synonyms, antonyms and the broader and narrower relations for employment come from Princeton University’s WordNet. Full sources and licences.