Koestler vs Arthur Koestler

Koestler and Arthur Koestler both are nouns.

Word	Noun	Adjective	Verb	Adverb
Koestler	Yes	No	No	No
Arthur Koestler	Yes	No	No	No

As nouns, Koestler and Arthur Koestler are synonyms defined as:

Koestler and Arthur Koestler: British writer (born in Hungary) who wrote a novel exposing the Stalinist purges during the 1930s (1905-1983)

Koestler (noun)	Arthur Koestler (noun)
British writer (born in Hungary) who wrote a novel exposing the Stalinist purges during the 1930s (1905-1983)	British writer (born in Hungary) who wrote a novel exposing the Stalinist purges during the 1930s (1905-1983)