pilot biscuit vs pilot bread

pilot biscuit and pilot bread both are nouns.

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

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

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

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

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