ditch and dump can be used as verbs. ravine is only a noun.
A ditch is a small valley shaped dip in the ground like on the sides of a road.
A dump can be a hole in the ground but usually it's just flat land where people storage garbage in the town or city.
A ravine is like a reeaaaaallly big ditch. Basically, it's between the sizes of a ditch and the Grand Canyon. It's a narrow, steep-sided valley commonly eroded by running water. Much like a canyon, but is often heavily wooded and lush with wildlife, often containing a river.
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