music genre vs crossover

music genre and crossover both are nouns.

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

music genre (noun)	crossover (noun)
an expressive style of music	a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other
	the appropriation of a new style (especially in popular music) by combining elements of different genres in order to appeal to a wider audience
	a voter who is registered as a member of one political party but who votes in the primary of another party
	the interchange of sections between pairing homologous chromosomes during the prophase of meiosis