invasion vs invade

invasion is a noun but invade is not a noun.

Word	Noun	Adjective	Verb	Adverb
invasion	Yes	No	No	No
invade	No	No	Yes	No

invasion (noun)	invade (noun)
the act of invading; the act of an army that invades for conquest or plunder
any entry into an area not previously occupied
(pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body

invasion (verb)	invade (verb)
	march aggressively into another's territory by military force for the purposes of conquest and occupation
	penetrate or assault, in a harmful or injurious way
	to intrude upon, infringe, encroach on, violate
	occupy in large numbers or live on a host