First of all your question should read: "Whats another word for 'edge'?" or "What is another word for edge?" Don't EVER use "What is a other" the word "another" was created for a reason! But what kind of edge? A precipice is an edge. Then there's tip. Try looking at a thesaurus.
Another word for bark is edge.
Ledge or edge
rim
curved corner
Side, rim
ridge, edge,top
"tree line" and/or "timberline"
Winning chances. House edge is another word you can use but the meaning is not exactly the same.
edge
An edge is another word for a border of an object. When people refer to edges they are usually referring to the outline or outside perimeter.
Another word for mountain ridge is arête which is the French word for edge or ridge.