coat-of-mail shell vs sea cradle

coat-of-mail shell and sea cradle both are nouns.

Word	Noun	Adjective	Verb	Adverb
coat-of-mail shell	Yes	No	No	No
sea cradle	Yes	No	No	No

As nouns, coat-of-mail shell and sea cradle are synonyms defined as:

coat-of-mail shell and sea cradle: primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates

Other synonyms of coat-of-mail shell include chiton, polyplacophore.

coat-of-mail shell (noun)	sea cradle (noun)
primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates	primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates