Coop is absolutely correct. A die chip is the result of a piece of the die weakening and coming out. They only happen at the edges of devices or along die cracks. They don't just happen in random spots. There has to be a reason for the weakening. They ALWAYS have very sharp and jagged edges, because they are the result of a piece of metal breaking from force.
Jack hammer a piece out of a sidewalk...this is what a die chip looks like.
Die gouges are divots taken out of the die with a tool. Something hit the die hard enough to cut a trench in the die's surface. Die gouges are generally straight and have sharp edges, and have no direct relation to the devices.
Drag a trailer hitch or a muffler really hard across the end of a driveway....die gouge.
Die dents are usually smooth edged and have nothing to do with the devices. They can be caused by a number of things and are basically a gouge. Difference being that a dent doesn't have missing metal, and usually a gouge does.
Hit hot asphalt with a sledge hammer and dent it....die dent.