butt on vs border

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

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

As verbs, butt on and border are synonyms defined as:

Other synonyms of butt on include abut, adjoin, butt, butt against, edge, march.

butt 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

butt on (verb)	border (verb)
lie adjacent to another or share a boundary	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