hardtack

English Thesaurus

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

hypernym	:	biscuit,
definition	:	small round bread leavened with baking-powder or soda (noun.food)

2. a mountain mahogany (noun.substance)

hypernym	:	mahogany, mahogany tree,
definition	:	any of various tropical timber trees of the family Meliaceae especially the genus Swietinia valued for their hard yellowish- to reddish-brown wood that is readily worked and takes a high polish (noun.plant)