Husayn vs King Hussein

Husayn and King Hussein both are nouns.

Word	Noun	Adjective	Verb	Adverb
Husayn	Yes	No	No	No
King Hussein	Yes	No	No	No

As nouns, Husayn and King Hussein are synonyms defined as:

Husayn and King Hussein: king of Jordan credited with creating stability at home and seeking peace with Israel (1935-1999)

Other synonyms of Husayn include Husain, Hussein, Hussein of Jordan, ibn Talal Hussein.

Husayn (noun)	King Hussein (noun)
king of Jordan credited with creating stability at home and seeking peace with Israel (1935-1999)	king of Jordan credited with creating stability at home and seeking peace with Israel (1935-1999)
Iraqi leader who waged war against Iran; his invasion of Kuwait led to the Gulf War (born in 1937)