polyplacophore vs sea cradle

polyplacophore and sea cradle both are nouns.

Word	Noun	Adjective	Verb	Adverb
polyplacophore	Yes	No	No	No
sea cradle	Yes	No	No	No

As nouns, polyplacophore and sea cradle are synonyms defined as:

polyplacophore and sea cradle: primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates

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

polyplacophore (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