Coat-of-mail shell and Mollusk

Coat-of-mail shell noun - Primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates.

Mollusk and coat-of-mail shell are semantically related. In some cases you can use "Mollusk" instead a noun phrase "Coat-of-mail shell".

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

Coat-of-mail shell and mollusk are semantically related. Sometimes you can replace phrase "Coat-of-mail shell" with "Mollusk", this terms are similar.