William Kidd vs Kidd

William Kidd and Kidd both are nouns.

Word	Noun	Adjective	Verb	Adverb
William Kidd	Yes	No	No	No
Kidd	Yes	No	No	No

As nouns, William Kidd and Kidd are synonyms defined as:

William Kidd and Kidd: Scottish sea captain who was hired to protect British shipping in the Indian Ocean and then was accused of piracy and hanged (1645-1701)

Other synonyms of William Kidd include Captain Kidd.

William Kidd (noun)	Kidd (noun)
Scottish sea captain who was hired to protect British shipping in the Indian Ocean and then was accused of piracy and hanged (1645-1701)	Scottish sea captain who was hired to protect British shipping in the Indian Ocean and then was accused of piracy and hanged (1645-1701)