Sid Caesar vs Sidney Caesar

Sid Caesar and Sidney Caesar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sid Caesar	Yes	No	No	No
Sidney Caesar	Yes	No	No	No

As nouns, Sid Caesar and Sidney Caesar are synonyms defined as:

Sid Caesar and Sidney Caesar: United States comedian who pioneered comedy television shows (born 1922)

Other synonyms of Sid Caesar include Caesar.

Sid Caesar (noun)	Sidney Caesar (noun)
United States comedian who pioneered comedy television shows (born 1922)	United States comedian who pioneered comedy television shows (born 1922)