stratification has 1 distinct synonym spread across 1 of its 5 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.
the act or process or arranging persons into classes or social strata
the condition of being arranged in social strata or classes within a group
Synonyms, antonyms and the broader and narrower relations for stratification come from Princeton University’s WordNet. Full sources and licences.
forming or depositing in layers
the placing of seeds in damp sand or sawdust or peat moss in order to preserve them or promote germination