sea biscuit vs pilot bread

sea biscuit and pilot bread both are nouns.

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

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

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

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

sea 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