Seven Hills of Rome vs hill

Seven Hills of Rome and hill both are nouns.

Word	Noun	Adjective	Verb	Adverb
Seven Hills of Rome	Yes	No	No	No
hill	Yes	No	Yes	No

Seven Hills of Rome (noun)	hill (noun)
the hills on which the ancient city of Rome was built	(baseball) the slight elevation on which the pitcher stands
	structure consisting of an artificial heap or bank usually of earth or stones
	a local and well-defined elevation of the land

Seven Hills of Rome (verb)	hill (verb)
	form into a hill