Roman vs roman

Roman and roman both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roman	Yes	Yes	No	No
roman	Yes	No	No	No

Roman (noun)	roman (noun)
a resident of modern Rome	a typeface used in ancient Roman inscriptions
an inhabitant of the ancient Roman Empire

Roman (adjective)	roman (adjective)
of or relating to or supporting Romanism
of or relating to or derived from Rome (especially ancient Rome)
characteristic of the modern type that most directly represents the type used in ancient Roman inscriptions