gen x has 1 distinct synonym spread across 1 of its 1 sense. 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 generation following the baby boom (especially Americans and Canadians born in the 1960s and 1970s)
Synonyms, antonyms and the broader and narrower relations for gen x come from Princeton University’s WordNet. Full sources and licences.