Nouns

(n)shielda protective covering or structure
(n)shield, bucklerarmor carried on the arm to intercept blows
(n)carapace, shell, cuticle, shieldhard outer covering or case of certain organisms such as arthropods and turtles

Verbs

(v)shield, screenprotect, hide, or conceal from danger or harm
(v)harbor, harbour, shieldhold back a thought or feeling about“She is harboring a grudge against him”