patroller vs patrol

patroller and patrol both are nouns.

Word	Noun	Adjective	Verb	Adverb
patroller	Yes	No	No	No
patrol	Yes	No	Yes	No

patroller (noun)	patrol (noun)
someone on patrol duty; an individual or a member of a group that patrols an area	the activity of going around or through an area at regular intervals for security purposes
	a detachment used for security or reconnaissance
	a group that goes through a region at regular intervals for the purpose of security

patroller (verb)	patrol (verb)
	maintain the security of by carrying out a patrol