Guardian
Part of speech: noun
Definition: Someone who guards, watches over, or protects. A person legally responsible for a minor (in loco parentis). A person legally responsible for an incompetent person. A superior in a Franciscan monastery. A major or final enemy; boss.
Example sentence: The advancement and diffusion of knowledge is the only guardian of true liberty.
Custodial
Part of speech: adjective
Definition: Providing protection, care, supervision or guardingOf, pertaining to or providing custody, especially of a childProviding punishment by incarceration