Captain Kidd vs Kidd

Captain Kidd and Kidd both are nouns.

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

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

Captain 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 Captain Kidd include William Kidd.

Captain 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)