Douglass vs Frederick Douglass

Douglass and Frederick Douglass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Douglass	Yes	No	No	No
Frederick Douglass	Yes	No	No	No

As nouns, Douglass and Frederick Douglass are synonyms defined as:

Douglass and Frederick Douglass: United States abolitionist who escaped from slavery and became an influential writer and lecturer in the North (1817-1895)

Douglass (noun)	Frederick Douglass (noun)
United States abolitionist who escaped from slavery and became an influential writer and lecturer in the North (1817-1895)	United States abolitionist who escaped from slavery and became an influential writer and lecturer in the North (1817-1895)