company has 10 distinct synonyms spread across 6 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.
an institution created to conduct business
“he only invests in large well-established companies”
the state of being with someone
“he missed their company”
organization of performers and associated personnel (especially theatrical)
“the traveling company all stayed at the same hotel”
a social gathering of guests or companions
“the house was filled with company when I arrived”
a band of people associated temporarily in some activity
“they organized a party to search for food”
crew of a ship including the officers; the whole force or personnel of a ship
a unit of firefighters including their equipment
“a hook-and-ladder company”
Synonyms, antonyms and the broader and narrower relations for company come from Princeton University’s WordNet. Full sources and licences.