police vs patrol

police and patrol both are nouns.

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

As verbs, police and patrol are synonyms defined as:

police (noun)	patrol (noun)
the force of policemen and officers	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

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