dubstep vs music genre

dubstep and music genre both are nouns.

Word	Noun	Adjective	Verb	Adverb
dubstep	Yes	No	No	No
music genre	Yes	No	No	No

As nouns, music genre is a hypernym of dubstep; that is, music genre is a word with a broader meaning than dubstep:

dubstep: A genre of electronic music descended from 2-step garage, characterised by its dark mood, sparse, half-step and two-step rhythms, an average bpm of 140 and an emphasis on sub-bass.
music genre: an expressive style of music

Other hypernyms of dubstep include musical genre, musical style.

dubstep (noun)	music genre (noun)
A genre of electronic music descended from 2-step garage, characterised by its dark mood, sparse, half-step and two-step rhythms, an average bpm of 140 and an emphasis on sub-bass.	an expressive style of music