bourn vs boundary

bourn and boundary both are nouns.

Word	Noun	Adjective	Verb	Adverb
bourn	Yes	No	No	No
boundary	Yes	No	No	No

As nouns, boundary is a hypernym of bourn; that is, boundary is a word with a broader meaning than bourn:

Other hypernyms of bourn include bound, bounds.

bourn (noun)	boundary (noun)
an archaic term for a goal or destination	the greatest possible degree of something
an archaic term for a boundary	the line or plane indicating the limit or extent of something
	a line determining the limits of an area