extrauterine pregnancy vs eccyesis

extrauterine pregnancy and eccyesis both are nouns.

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

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

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

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

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