roman type vs roman

roman type and roman both are nouns.

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

As nouns, roman type and roman are synonyms defined as:

Other synonyms of roman type include roman letters, roman print.

roman type (noun)	roman (noun)
a typeface used in ancient Roman inscriptions	a typeface used in ancient Roman inscriptions