roof vs dome

roof and dome both are nouns.

Word	Noun	Adjective	Verb	Adverb
roof	Yes	No	Yes	No
dome	Yes	No	No	No

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

roof (noun)	dome (noun)
a protective covering that covers or forms the top of a building	a hemispherical roof
protective covering on top of a motor vehicle	a stadium that has a roof
an upper limit on what is allowed	informal terms for a human head
the inner top surface of a covered area or hollow space	a concave shape whose distinguishing characteristic is that the concavity faces downward

roof (verb)	dome (verb)
provide a building with a roof; cover a building with a roof