Mel Gibson vs Mel Columcille Gerard Gibson

Mel Gibson and Mel Columcille Gerard Gibson both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mel Gibson	Yes	No	No	No
Mel Columcille Gerard Gibson	Yes	No	No	No

As nouns, Mel Gibson and Mel Columcille Gerard Gibson are synonyms defined as:

Mel Gibson and Mel Columcille Gerard Gibson: Australian actor (born in the United States in 1956)

Other synonyms of Mel Gibson include Gibson.

Mel Gibson (noun)	Mel Columcille Gerard Gibson (noun)
Australian actor (born in the United States in 1956)	Australian actor (born in the United States in 1956)