sexually transmitted disease vs Cupid's itch

sexually transmitted disease and Cupid's itch both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexually transmitted disease	Yes	No	No	No
Cupid's itch	Yes	No	No	No

As nouns, sexually transmitted disease and Cupid's itch are synonyms defined as:

sexually transmitted disease and Cupid's itch: a communicable infection transmitted by sexual intercourse or genital contact

Other synonyms of sexually transmitted disease include Cupid's disease, dose, social disease, STD, VD, venereal disease, venereal infection, Venus's curse.

sexually transmitted disease (noun)	Cupid's itch (noun)
a communicable infection transmitted by sexual intercourse or genital contact	a communicable infection transmitted by sexual intercourse or genital contact