oasis vs shelter

oasis and shelter both are nouns.

Word	Noun	Adjective	Verb	Adverb
oasis	Yes	No	No	No
shelter	Yes	No	Yes	No

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

oasis (noun)	shelter (noun)
a shelter serving as a place of safety or sanctuary	a structure that provides privacy and protection from danger
a fertile tract in a desert (where the water table approaches the surface)	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

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