edge

Noun
  1. The border or part adjacent to the line of division; the outermost point. Noun
    She stood at the edge of the cliff.
  2. A sharp side of a blade or tool. Noun
    The knife has a very sharp edge.
  3. An advantage or leading position. Noun
    He has an edge over his competitors.
synonyms: border, rim, margin, brink, verge