Robert Anson Heinlein vs Heinlein

Robert Anson Heinlein and Heinlein both are nouns.

Word	Noun	Adjective	Verb	Adverb
Robert Anson Heinlein	Yes	No	No	No
Heinlein	Yes	No	No	No

As nouns, Robert Anson Heinlein and Heinlein are synonyms defined as:

Robert Anson Heinlein and Heinlein: United States writer of science fiction (1907-1988)

Other synonyms of Robert Anson Heinlein include Robert A. Heinlein.

Robert Anson Heinlein (noun)	Heinlein (noun)
United States writer of science fiction (1907-1988)	United States writer of science fiction (1907-1988)