bikers vs youth subculture

bikers and youth subculture both are nouns.

Word	Noun	Adjective	Verb	Adverb
bikers	Yes	No	No	No
youth subculture	Yes	No	No	No

As nouns, youth subculture is a hypernym of bikers; that is, youth subculture is a word with a broader meaning than bikers:

bikers: originally a British youth subculture that evolved out of the teddy boys in the 1960s; wore black leather jackets and jeans and boots; had greased hair and rode motorcycles and listened to rock'n'roll; were largely unskilled manual laborers
youth subculture: 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

bikers (noun)	youth subculture (noun)
originally a British youth subculture that evolved out of the teddy boys in the 1960s; wore black leather jackets and jeans and boots; had greased hair and rode motorcycles and listened to rock'n'roll; were largely unskilled manual laborers	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