amorousness vs sexual desire

amorousness and sexual desire both are nouns.

Word	Noun	Adjective	Verb	Adverb
amorousness	Yes	No	No	No
sexual desire	Yes	No	No	No

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

Other hypernyms of amorousness include concupiscence, eros, physical attraction.

amorousness (noun)	sexual desire (noun)
a feeling of love or fondness	a desire for sexual intimacy
the arousal of feelings of sexual desire