gravida vs adult female

gravida and adult female both are nouns.

Word	Noun	Adjective	Verb	Adverb
gravida	Yes	No	No	No
adult female	Yes	No	No	No

As nouns, adult female is a hypernym of gravida; that is, adult female is a word with a broader meaning than gravida:

Other hypernyms of gravida include woman.

gravida (noun)	adult female (noun)
a pregnant woman	an adult female person (as opposed to a man)
the number of the pregnancy that a woman is in