pilot bread vs pilot biscuit

pilot bread and pilot biscuit both are nouns.

Word	Noun	Adjective	Verb	Adverb
pilot bread	Yes	No	No	No
pilot biscuit	Yes	No	No	No

As nouns, pilot bread and pilot biscuit are synonyms defined as:

pilot bread and pilot biscuit: very hard unsalted biscuit or bread; a former ship's staple

Other synonyms of pilot bread include hardtack, sea biscuit, ship biscuit.

pilot bread (noun)	pilot biscuit (noun)
very hard unsalted biscuit or bread; a former ship's staple	very hard unsalted biscuit or bread; a former ship's staple