developing has 2 distinct synonyms spread across 2 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.
processing a photosensitive material in order to make an image visible
“the development and printing of his pictures took only two hours”
relating to societies in which capital needed to industrialize is in short supply
Synonyms, antonyms and the broader and narrower relations for developing come from Princeton University’s WordNet. Full sources and licences.