As nouns the difference between guardian and patrol
is that
guardian is someone who guards, watches over, or protects while
patrol is a going of the rounds along the chain of sentinels and between the posts, by a guard, usually consisting of three or four men, to insure greater security from attacks on the outposts.
As a proper noun Guardian
is a British daily national newspaper.
As a verb patrol is
to go the rounds along a chain of sentinels; to traverse a police district or beat.