chiton vs coat-of-mail shell

chiton and coat-of-mail shell both are nouns.

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

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

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

Other synonyms of chiton include polyplacophore, sea cradle.

chiton (noun)	coat-of-mail shell (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
a woolen tunic worn by men and women in ancient Greece