storm cellar vs shelter

storm cellar and shelter both are nouns.

Word	Noun	Adjective	Verb	Adverb
storm cellar	Yes	No	No	No
shelter	Yes	No	Yes	No

As nouns, shelter is a hypernym of storm cellar; that is, shelter is a word with a broader meaning than storm cellar:

storm cellar (noun)	shelter (noun)
an underground shelter where you can go until a storm passes	a structure that provides privacy and protection from danger
	protective covering that provides protection from the weather
	temporary housing for homeless or displaced persons
	a way of organizing business to reduce the taxes it must pay on current earnings
	the condition of being protected

storm cellar (verb)	shelter (verb)
	invest (money) so that it is not taxable
	provide shelter for