President Bush vs Dubya

President Bush and Dubya both are nouns.

Word	Noun	Adjective	Verb	Adverb
President Bush	Yes	No	No	No
Dubya	Yes	No	No	No

As nouns, President Bush and Dubya are synonyms defined as:

President Bush and Dubya: 43rd President of the United States; son of George Herbert Walker Bush (born in 1946)

Other synonyms of President Bush include Bush, Dubyuh, George Bush, George W. Bush, George Walker Bush, President George W. Bush.

President Bush (noun)	Dubya (noun)
vice president under Reagan and 41st President of the United States (born in 1924)	43rd President of the United States; son of George Herbert Walker Bush (born in 1946)
43rd President of the United States; son of George Herbert Walker Bush (born in 1946)