hybrid has 5 distinct synonyms spread across 3 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.
a word that is composed of parts from different languages (e.g., `monolingual' has a Greek prefix and a Latin root)
a composite of mixed origin
“the vice-presidency is a hybrid of administrative and legislative offices”
(genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species
“a mule is a cross between a horse and a donkey”
produced by crossbreeding
Synonyms, antonyms and the broader and narrower relations for hybrid come from Princeton University’s WordNet. Full sources and licences.