intrusion vs intrude

intrusion is a noun but intrude is not a noun.

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

intrusion (noun)	intrude (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

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