Capitol Hill vs the Hill

Capitol Hill and the Hill both are nouns.

Word	Noun	Adjective	Verb	Adverb
Capitol Hill	Yes	No	No	No
the Hill	Yes	No	No	No

As nouns, Capitol Hill and the Hill are synonyms defined as:

Capitol Hill and the Hill: a hill in Washington, D.C., where the Capitol Building sits and Congress meets

Capitol Hill (noun)	the Hill (noun)
a hill in Washington, D.C., where the Capitol Building sits and Congress meets	a hill in Washington, D.C., where the Capitol Building sits and Congress meets