patrol vs troop

patrol

noun
  • The guards who go the rounds for observation; a detachment whose duty it is to patrol. 

  • A movement, by a small body of troops beyond the line of outposts, to explore the country and gain intelligence of the enemy's whereabouts. 

  • Any perambulation of a particular line or district to guard it; also, the people thus guarding. 

  • A unit of a troop, usually defined by certain ranks or age groups within the troop, and ideally comprised of six to eight members. 

  • The largest division of officers within a police department or sheriff's office, whose assignment is to patrol and respond to calls for service. 

  • 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. 

verb
  • To go the rounds of, as a sentry, guard, or policeman 

  • To go the rounds along a chain of sentinels; to traverse a police district or beat. 

troop

noun
  • A detachment of soldiers or police, especially horse artillery, armour, or state troopers. 

  • Mushrooms that are in a close group but not close enough to be called a cluster. 

  • A group of meerkat families living together. 

  • A collection of people; a number; a multitude (in general). 

  • A company of actors; a troupe. 

  • A chapter of a national girl or boy scouts organization, consisting of one or more patrols of 6 to 8 youngsters each. 

  • A particular roll of the drum; a quick march. 

  • A group of baboons. 

  • A group of soldiers; military forces. 

  • A small unit of cavalry or armour commanded by a captain, corresponding to a platoon or company of infantry. 

  • An individual soldier or member of a military force. 

verb
  • To march on; to go forward in haste. 

  • To move in numbers; to come or gather in crowds or troops. 

  • To move or march as if in a crowd. 

How often have the words patrol and troop occurred in a corpus of books? (source: Google Ngram Viewer )