WordNet records no synonym and no antonym for youth subculture. 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 minority youth culture whose distinctiveness depended largely on the social class and ethnic background of its members; often characterized by its adoption of a particular music genre
Synonyms, antonyms and the broader and narrower relations for youth subculture come from Princeton University’s WordNet. Full sources and licences.