Anton Grigorevich Rubinstein vs Anton Gregor Rubinstein

Anton Grigorevich Rubinstein and Anton Gregor Rubinstein both are nouns.

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

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

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

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

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