Hardtack and Pretzel

Hardtack noun - Very hard unsalted biscuit or bread; a former ship's staple.

Pretzel and hardtack are semantically related in hard topic. In some cases you can use "Pretzel" instead a noun "Hardtack".

Pretzel noun - Glazed and salted cracker typically in the shape of a loose knot.

Hardtack and pretzel are semantically related in hard topic. You can use "Hardtack" instead a noun "Pretzel".