edge vs selvage

edge and selvage both are nouns.

Word	Noun	Adjective	Verb	Adverb
edge	Yes	No	Yes	No
selvage	Yes	No	No	No

As nouns, selvage is a hyponym of edge; that is, selvage is a word with a more specific, narrower meaning than edge:

edge: the outside limit of an object or area or surface; a place farthest away from the center of something
selvage: the edge of a fabric that is woven so that it will not ravel or fray

Other hyponyms of edge include border, hem, luff, border, molding, moulding, selvedge, berm, shoulder, roadside, wayside.

edge (noun)	selvage (noun)
a sharp side formed by the intersection of two surfaces of an object	the edge of a fabric that is woven so that it will not ravel or fray
the outside limit of an object or area or surface; a place farthest away from the center of something	border consisting of an ornamental fringe at either end of an oriental carpet
a slight competitive advantage
the attribute of urgency in tone of voice
the boundary of a surface
a line determining the limits of an area

edge (verb)	selvage (verb)
lie adjacent to another or share a boundary
provide with an edge
advance slowly, as if by inches
provide with a border or edge