Henry Morgan vs Sir Henry Morgan

Henry Morgan and Sir Henry Morgan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Henry Morgan	Yes	No	No	No
Sir Henry Morgan	Yes	No	No	No

As nouns, Henry Morgan and Sir Henry Morgan are synonyms defined as:

Henry Morgan and Sir Henry Morgan: a Welsh buccaneer who raided Spanish colonies in the West Indies for the English (1635-1688)

Other synonyms of Henry Morgan include Morgan.

Henry Morgan (noun)	Sir Henry Morgan (noun)
a Welsh buccaneer who raided Spanish colonies in the West Indies for the English (1635-1688)	a Welsh buccaneer who raided Spanish colonies in the West Indies for the English (1635-1688)