shelter vs roost

shelter and roost both are nouns.

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

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

Other hyponyms of shelter include bell cot, bell cote, birdhouse, canopy, cote, dog house, doghouse, kennel, lean-to, sconce, sentry box.

shelter (noun)	roost (noun)
a structure that provides privacy and protection from danger	a perch on which domestic fowl rest or sleep
protective covering that provides protection from the weather	a shelter with perches for fowl or other birds
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)	roost (verb)
invest (money) so that it is not taxable	settle down or stay, as if on a roost
provide shelter for	sit, as on a branch