Bonney vs Billy the Kid

Bonney and Billy the Kid both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bonney	Yes	No	No	No
Billy the Kid	Yes	No	No	No

As nouns, Bonney and Billy the Kid are synonyms defined as:

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

Other synonyms of Bonney include Billie the Kid, William H. Bonney.

Bonney (noun)	Billy the Kid (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)