phytology vs estivation

phytology and estivation both are nouns.

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

phytology (noun)	estivation (noun)
the branch of biology that studies plants	(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