encroach upon vs obtrude upon

encroach upon and obtrude upon both are verbs.

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

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

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

Other synonyms of encroach upon include intrude on, invade.

encroach upon (verb)	obtrude upon (verb)
to intrude upon, infringe, encroach on, violate	to intrude upon, infringe, encroach on, violate