intrude vs intrusion

intrude is not a noun while intrusion is a noun.

Word	Noun	Adjective	Verb	Adverb
intrude	No	No	Yes	No
intrusion	Yes	No	No	No

intrude (noun)	intrusion (noun)
	entry to another's property without right or permission
	entrance by force or without permission or welcome
	any entry into an area not previously occupied
	rock produced by an intrusive process
	the forcing of molten rock into fissures or between strata of an earlier rock formation

intrude (verb)	intrusion (verb)
thrust oneself in as if by force
enter uninvited
search or inquire in a meddlesome way
enter unlawfully on someone's property