succuba vs succubus

succuba and succubus both are nouns.

Word	Noun	Adjective	Verb	Adverb
succuba	Yes	No	No	No
succubus	Yes	No	No	No

As nouns, succuba and succubus are synonyms defined as:

succuba and succubus: a female demon believed to have sexual intercourse with sleeping men

succuba (noun)	succubus (noun)
a female demon believed to have sexual intercourse with sleeping men	a female demon believed to have sexual intercourse with sleeping men