Baking-powder biscuit and Shortcake

Baking-powder biscuit noun - Leavened with baking powder.

Shortcake and baking-powder biscuit are semantically related. In some cases you can replace term "Shortcake" with "Baking-powder biscuit", this terms are similar.

Shortcake noun - Very short biscuit dough baked as individual biscuits or a round loaf; served with sweetened fruit and usually whipped cream.

Baking-powder biscuit and shortcake are semantically related. You can use "Baking-powder biscuit" instead a noun "Shortcake".