roman vs roman type

roman and roman type both are nouns.

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

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

Other synonyms of roman include roman letters, roman print.

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