WordNet records no synonym and no antonym for rockabilly. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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 fusion of black music and country music that was popular in the 1950s; sometimes described as blues with a country beat
Synonyms, antonyms and the broader and narrower relations for rockabilly come from Princeton University’s WordNet. Full sources and licences.