sexual activity vs gestation

sexual activity and gestation both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual activity	Yes	No	No	No
gestation	Yes	No	No	No

sexual activity (noun)	gestation (noun)
activities associated with sexual intercourse	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)