Anton Rubinstein vs Anton Gregor Rubinstein

Anton Rubinstein and Anton Gregor Rubinstein both are nouns.

Word	Noun	Adjective	Verb	Adverb
Anton Rubinstein	Yes	No	No	No
Anton Gregor Rubinstein	Yes	No	No	No

As nouns, Anton Rubinstein and Anton Gregor Rubinstein are synonyms defined as:

Anton Rubinstein and Anton Gregor Rubinstein: Russian composer and pianist (1829-1894)

Other synonyms of Anton Rubinstein include Anton Grigorevich Rubinstein, Anton Rubenstein, Rubinstein.

Anton Rubinstein (noun)	Anton Gregor Rubinstein (noun)
Russian composer and pianist (1829-1894)	Russian composer and pianist (1829-1894)