gravidity vs gestation

gravidity and gestation both are nouns.

Word	Noun	Adjective	Verb	Adverb
gravidity	Yes	No	No	No
gestation	Yes	No	No	No

As nouns, gestation is a hypernym of gravidity; that is, gestation is a word with a broader meaning than gravidity:

gravidity: technical terms for pregnancy
gestation: the state of being pregnant; the period from conception to birth when a woman carries a developing fetus in her uterus

Other hypernyms of gravidity include maternity, pregnancy.

gravidity (noun)	gestation (noun)
technical terms for pregnancy	the conception and development of an idea or plan
	the state of being pregnant; the period from conception to birth when a woman carries a developing fetus in her uterus
	the period during which an embryo develops (about 266 days in humans)