succubus vs succuba

succubus and succuba both are nouns.

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

As nouns, succubus and succuba are synonyms defined as:

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

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