Morel and Petty morel

Morel noun - Any of various edible mushrooms of the genus Morchella having a brownish spongelike cap.

Petty morel and morel are semantically related. In some cases you can use "Petty morel" instead a noun "Morel".

Petty morel noun - Unarmed woody rhizomatous perennial plant distinguished from wild sarsaparilla by more aromatic roots and panicled umbels; southeastern North America to Mexico.

Morel and petty morel are semantically related. You can use "Morel" instead a noun phrase "Petty morel".