shelter vs storm cellar

shelter and storm cellar both are nouns.

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

As nouns, storm cellar is a hyponym of shelter; that is, storm cellar is a word with a more specific, narrower meaning than shelter:

shelter (noun)	storm cellar (noun)
a structure that provides privacy and protection from danger	an underground shelter where you can go until a storm passes
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

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