incubation vs incubate

incubation is a noun but incubate is not a noun.

Word	Noun	Adjective	Verb	Adverb
incubation	Yes	No	No	No
incubate	No	No	Yes	No

incubation (noun)	incubate (noun)
maintaining something at the most favorable temperature for its development
sitting on eggs so as to hatch them by the warmth of the body
(pathology) the phase in the development of an infection between the time a pathogen enters the body and the time the first symptoms appear

incubation (verb)	incubate (verb)
	sit on (eggs)
	grow under conditions that promote development