border vs hem in

border is a noun but hem in is not a noun.

Word	Noun	Adjective	Verb	Adverb
border	Yes	No	Yes	No
hem in	No	No	Yes	No

As verbs, hem in is a hyponym of border; that is, hem in is a word with a more specific, narrower meaning than border:

Other hyponyms of border include fringe, gird, girdle, cloister, close in, enclose, inclose, shut in, cloister.

border (noun)	hem in (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)	hem in (verb)
lie adjacent to another or share a boundary	surround so as to force to give up
extend on all sides of simultaneously; encircle	surround in a restrictive manner
enclose in or as if in a frame
provide with a border or edge
form the boundary of; be contiguous to