shield vs carapace

shield and carapace both are nouns.

Word	Noun	Adjective	Verb	Adverb
shield	Yes	No	Yes	No
carapace	Yes	No	No	No

As nouns, shield and carapace are synonyms defined as:

shield and carapace: hard outer covering or case of certain organisms such as arthropods and turtles

Other synonyms of shield include cuticle, shell.

shield (noun)	carapace (noun)
hard outer covering or case of certain organisms such as arthropods and turtles	hard outer covering or case of certain organisms such as arthropods and turtles
armor carried on the arm to intercept blows
a protective covering or structure

shield (verb)	carapace (verb)
protect, hide, or conceal from danger or harm
hold back a thought or feeling about