lean-to vs shelter

lean-to and shelter both are nouns.

Word	Noun	Adjective	Verb	Adverb
lean-to	Yes	No	No	No
shelter	Yes	No	Yes	No

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

lean-to (noun)	shelter (noun)
rough shelter whose roof has only one slope	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

lean-to (verb)	shelter (verb)
	invest (money) so that it is not taxable
	provide shelter for