cybersex vs sexual arousal

cybersex and sexual arousal both are nouns.

Word	Noun	Adjective	Verb	Adverb
cybersex	Yes	No	No	No
sexual arousal	Yes	No	No	No

As nouns, sexual arousal is a hypernym of cybersex; that is, sexual arousal is a word with a broader meaning than cybersex:

cybersex: sexual arousal involving communication on the internet
sexual arousal: the arousal of sexual desires in preparation for sexual behavior

cybersex (noun)	sexual arousal (noun)
sexual arousal involving communication on the internet	the arousal of sexual desires in preparation for sexual behavior