estivation vs estivate

estivation is a noun but estivate is not a noun.

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

estivation (noun)	estivate (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

estivation (verb)	estivate (verb)
	sleep during summer