prolapse vs prolapsus

prolapse and prolapsus both are nouns.

Word	Noun	Adjective	Verb	Adverb
prolapse	Yes	No	Yes	No
prolapsus	Yes	No	No	No

As nouns, prolapse and prolapsus are synonyms defined as:

prolapse and prolapsus: the slipping or falling out of place of an organ (as the uterus)

Other synonyms of prolapse include descensus.

prolapse (noun)	prolapsus (noun)
the slipping or falling out of place of an organ (as the uterus)	the slipping or falling out of place of an organ (as the uterus)

prolapse (verb)	prolapsus (verb)
slip or fall out of place, as of body parts