Sergei Vasilievich Rachmaninov vs Rachmaninoff

Sergei Vasilievich Rachmaninov and Rachmaninoff both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sergei Vasilievich Rachmaninov	Yes	No	No	No
Rachmaninoff	Yes	No	No	No

As nouns, Sergei Vasilievich Rachmaninov and Rachmaninoff are synonyms defined as:

Sergei Vasilievich Rachmaninov and Rachmaninoff: composer and piano virtuoso born in Russia (1873-1943)

Other synonyms of Sergei Vasilievich Rachmaninov include Rachmaninov, Sergei Rachmaninoff, Sergei Rachmaninov, Sergei Vasilievich Rachmaninoff.

Sergei Vasilievich Rachmaninov (noun)	Rachmaninoff (noun)
composer and piano virtuoso born in Russia (1873-1943)	composer and piano virtuoso born in Russia (1873-1943)