crater vs natural depression

crater and natural depression both are nouns.

Word	Noun	Adjective	Verb	Adverb
crater	Yes	No	No	No
natural depression	Yes	No	No	No

As nouns, natural depression is a hypernym of crater; that is, natural depression is a word with a broader meaning than crater:

crater: a bowl-shaped depression formed by the impact of a meteorite or bomb
natural depression: a sunken or depressed geological formation

Other hypernyms of crater include depression.

crater (noun)	natural depression (noun)
a bowl-shaped depression formed by the impact of a meteorite or bomb	a sunken or depressed geological formation
a bowl-shaped geological formation at the top of a volcano