French person vs Gaul

French person and Gaul both are nouns.

Word	Noun	Adjective	Verb	Adverb
French person	Yes	No	No	No
Gaul	Yes	No	No	No

As nouns, Gaul is a hyponym of French person; that is, Gaul is a word with a more specific, narrower meaning than French person:

Other hyponyms of French person include frog, Parisian, Breton, Savoyard, Angevin, Angevine, Norman, Frenchman, Frenchwoman.

French person (noun)	Gaul (noun)
a person of French nationality	an ancient region of western Europe that included what is now northern Italy and France and Belgium and part of Germany and the Netherlands
	a Celt of ancient Gaul
	a person of French descent