patrol

nouns

a detachment used for security or reconnaissance
patrol
is a type of (narrower)
a small unit of troops of special composition
detachment
the activity of going around or through an area at regular intervals for security purposes
patrol
is a type of (narrower)
the activity of protecting someone or something
"the witnesses demanded police protection"
protection
a group that goes through a region at regular intervals for the purpose of security
patrol
is a type of (narrower)
group of people willing to obey orders
"a public force is necessary to give security to the rights of citizens"
force, personnel

verbs

maintain the security of by carrying out a patrol
patrol, police
is derived from
patroller