intrusion vs invasion

intrusion and invasion both are nouns.

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

As nouns, intrusion and invasion are synonyms defined as:

Other synonyms of intrusion include encroachment.

intrusion (noun)	invasion (noun)
entry to another's property without right or permission	the act of invading; the act of an army that invades for conquest or plunder
entrance by force or without permission or welcome	any entry into an area not previously occupied
any entry into an area not previously occupied	(pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body
rock produced by an intrusive process
the forcing of molten rock into fissures or between strata of an earlier rock formation