Sweeney Todd vs Todd

Sweeney Todd and Todd both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sweeney Todd	Yes	No	No	No
Todd	Yes	No	No	No

As nouns, Sweeney Todd and Todd are synonyms defined as:

Sweeney Todd and Todd: fictional character in a play by George Pitt; a barber who murdered his customers

Sweeney Todd (noun)	Todd (noun)
fictional character in a play by George Pitt; a barber who murdered his customers	Scottish chemist noted for his research into the structure of nucleic acids (born in 1907)
	fictional character in a play by George Pitt; a barber who murdered his customers