ectopic gestation vs eccyesis

ectopic gestation and eccyesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
ectopic gestation	Yes	No	No	No
eccyesis	Yes	No	No	No

As nouns, ectopic gestation and eccyesis are synonyms defined as:

ectopic gestation and eccyesis: pregnancy resulting from gestation elsewhere than in the uterus

Other synonyms of ectopic gestation include ectopic pregnancy, extrauterine gestation, extrauterine pregnancy, metacyesis.

ectopic gestation (noun)	eccyesis (noun)
pregnancy resulting from gestation elsewhere than in the uterus	pregnancy resulting from gestation elsewhere than in the uterus