crossover voter vs voter

crossover voter and voter both are nouns.

Word	Noun	Adjective	Verb	Adverb
crossover voter	Yes	No	No	No
voter	Yes	No	No	No

As nouns, voter is a hypernym of crossover voter; that is, voter is a word with a broader meaning than crossover voter:

crossover voter: a voter who is registered as a member of one political party but who votes in the primary of another party
voter: a citizen who has a legal right to vote

Other hypernyms of crossover voter include elector.

crossover voter (noun)	voter (noun)
a voter who is registered as a member of one political party but who votes in the primary of another party	a citizen who has a legal right to vote