Roger Mortimer vs Mortimer

Roger Mortimer and Mortimer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Roger Mortimer	Yes	No	No	No
Mortimer	Yes	No	No	No

As nouns, Roger Mortimer and Mortimer are synonyms defined as:

Roger Mortimer and Mortimer: English nobleman who deposed Edward II and was executed by Edward III (1287-1330)

Other synonyms of Roger Mortimer include Roger de Mortimer.

Roger Mortimer (noun)	Mortimer (noun)
English nobleman who deposed Edward II and was executed by Edward III (1287-1330)	English nobleman who deposed Edward II and was executed by Edward III (1287-1330)