shelter vs shack

shelter and shack both are nouns.

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

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

shelter (noun)	shack (noun)
a structure that provides privacy and protection from danger	small crude shelter used as a dwelling
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)	shack (verb)
invest (money) so that it is not taxable	move, proceed, or walk draggingly or slowly
provide shelter for	make one's home in a particular place or community