inheritance has 2 distinct synonyms spread across 4 of its 4 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.
that which is inherited; a title or property or estate that passes by law to the heir on the death of the owner
Synonyms, antonyms and the broader and narrower relations for inheritance come from Princeton University’s WordNet. Full sources and licences.
(genetics) attributes acquired via biological heredity from the parents
any attribute or immaterial possession that is inherited from ancestors
“my only inheritance was my mother's blessing”