border on vs border

border on is not a noun while border is a noun.

Word	Noun	Adjective	Verb	Adverb
border on	No	No	Yes	No
border	Yes	No	Yes	No

border on (noun)	border (noun)
	a strip forming the outer edge of something
	a decorative recessed or relieved surface on an edge
	a line that indicates a boundary
	the boundary of a surface
	the boundary line or the area immediately inside the boundary

border on (verb)	border (verb)
come near or verge on, resemble, come nearer in quality, or character	lie adjacent to another or share a boundary
	extend on all sides of simultaneously; encircle
	enclose in or as if in a frame
	provide with a border or edge
	form the boundary of; be contiguous to