invade vs encroach upon

invade and encroach upon both are verbs.

Word	Noun	Adjective	Verb	Adverb
invade	No	No	Yes	No
encroach upon	No	No	Yes	No

As verbs, invade and encroach upon are synonyms defined as:

invade and encroach upon: to intrude upon, infringe, encroach on, violate

Other synonyms of invade include intrude on, obtrude upon.

invade (verb)	encroach upon (verb)
march aggressively into another's territory by military force for the purposes of conquest and occupation	to intrude upon, infringe, encroach on, violate
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