Mollusk and Quahog

Mollusk noun - Invertebrate having a soft unsegmented body usually enclosed in a shell.

Quahog and mollusk are semantically related In some cases you can use "Quahog" instead a noun "Mollusk".

Quahog noun - Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes.

Mollusk and quahog are semantically related in bivalve living in ocean topic. You can use "Mollusk" instead a noun "Quahog".