border vs picture frame

border and picture frame both are nouns.

Word	Noun	Adjective	Verb	Adverb
border	Yes	No	Yes	No
picture frame	Yes	No	No	No

border (noun)	picture frame (noun)
a strip forming the outer edge of something	a framework in which a picture is mounted
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)	picture frame (verb)
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