different between unleavened vs hardtack

English

un- +? leavened

unleavened (not comparable)

without any yeast or other raising agent
They were eating unleavened bread.

hardtack (countable and uncountable, plural hardtacks)

(nautical) A large, hard biscuit made from unleavened flour and water; formerly used as a long-term staple food aboard ships.
Synonyms: Anzac wafer, sheet iron, tooth duller, worm castle (all military slang)
- 1989, H. T. Willetts (translator), Aleksandr Solzhenitsyn (author), August 1914, Farrar, Straus and Giroux, ?ISBN, page 71:
  Bread and fodder had to be brought up over longer and longer distances, it was more difficult all the time, transport was lacking, the army had already eaten two-thirds of its hardtack, exhausted men were marching in baking heat along sandy roads into emptiness!

(hard biscuit): pilot biscuit, pilot bread, sea biscuit, sea bread, ship's biscuit, ship biscuit

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