Groucho vs Groucho Marx

Groucho and Groucho Marx both are nouns.

Word	Noun	Adjective	Verb	Adverb
Groucho	Yes	No	No	No
Groucho Marx	Yes	No	No	No

As nouns, Groucho and Groucho Marx are synonyms defined as:

Groucho and Groucho Marx: United States comedian; one of four brothers who made motion pictures together (1890-1977)

Other synonyms of Groucho include Julius Marx, Marx.

Groucho (noun)	Groucho Marx (noun)
United States comedian; one of four brothers who made motion pictures together (1890-1977)	United States comedian; one of four brothers who made motion pictures together (1890-1977)