greed has 4 distinct synonyms spread across 1 of its 2 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.
excessive desire to acquire or possess more (especially more material wealth) than one needs or deserves
reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins)
Synonyms, antonyms and the broader and narrower relations for greed come from Princeton University’s WordNet. Full sources and licences.