ectopic pregnancy vs eccyesis

ectopic pregnancy and eccyesis both are nouns.

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

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

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

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

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