thatched roof vs roof

thatched roof and roof both are nouns.

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

As nouns, roof is a hypernym of thatched roof; that is, roof is a word with a broader meaning than thatched roof:

thatched roof (noun)	roof (noun)
a house roof made with a plant material (as straw)	a protective covering that covers or forms the top of a building
	protective covering on top of a motor vehicle
	an upper limit on what is allowed
	the inner top surface of a covered area or hollow space

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