inorganic has no recorded synonym. 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 organic.
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.
relating or belonging to the class of compounds not having a carbon basis
“hydrochloric and sulfuric acids are called inorganic substances”
lacking the properties characteristic of living organisms
Synonyms, antonyms and the broader and narrower relations for inorganic come from Princeton University’s WordNet. Full sources and licences.