French bread vs white bread

French bread and white bread both are nouns.

Word	Noun	Adjective	Verb	Adverb
French bread	Yes	No	No	No
white bread	Yes	No	No	No

As nouns, white bread is a hypernym of French bread; that is, white bread is a word with a broader meaning than French bread:

French bread: a crusty sourdough bread often baked in long slender tapered loaves or baguettes
white bread: bread made with finely ground and usually bleached wheat flour

Other hypernyms of French bread include light bread.

French bread (noun)	white bread (noun)
a crusty sourdough bread often baked in long slender tapered loaves or baguettes	bread made with finely ground and usually bleached wheat flour