border vs border on

border is a noun but border on is not a noun.

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

border (noun)	border on (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 (verb)	border on (verb)
lie adjacent to another or share a boundary	come near or verge on, resemble, come nearer in quality, or character
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