dominant has 5 distinct synonyms spread across 2 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. Its 2 recorded opposites are subordinate, recessive.
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.
exercising influence or control
“television plays a dominant role in molding public opinion”
(of genes) producing the same phenotype whether its allele is identical or dissimilar
(music) the fifth note of the diatonic scale
an allele that produces the same phenotype whether its paired allele is identical or different
Synonyms, antonyms and the broader and narrower relations for dominant come from Princeton University’s WordNet. Full sources and licences.