Billie the Kid vs William H. Bonney

Billie the Kid and William H. Bonney both are nouns.

Word	Noun	Adjective	Verb	Adverb
Billie the Kid	Yes	No	No	No
William H. Bonney	Yes	No	No	No

As nouns, Billie the Kid and William H. Bonney are synonyms defined as:

Billie the Kid and William H. Bonney: United States outlaw who was said to have killed 21 men (1859-1881)

Other synonyms of Billie the Kid include Billy the Kid, Bonney.

Billie the Kid (noun)	William H. Bonney (noun)
United States outlaw who was said to have killed 21 men (1859-1881)	United States outlaw who was said to have killed 21 men (1859-1881)