estivate vs estivation

estivate is not a noun while estivation is a noun.

Word	Noun	Adjective	Verb	Adverb
estivate	No	No	Yes	No
estivation	Yes	No	No	No

estivate (noun)	estivation (noun)
	(botany) the arrangement of sepals and petals in a flower bud before it opens
	(zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period

estivate (verb)	estivation (verb)
sleep during summer