Noun trooper has 4 senses
- cavalryman, trooper - a soldier in a motorized army unit
--1 is a kind of soldier
--1 is a member of cavalry, horse cavalry, horse
- trooper - a mounted policeman
--2 is a kind of policeman, police officer, officer
- trooper, state trooper - a state police officer
--3 is a kind of policeman, police officer, officer
- cavalryman, trooper - a soldier mounted on horseback; "a cavalryman always takes good care of his mount"
--4 is a kind of soldier
--4 is a member of cavalry
--4 has particulars: cuirassier; dragoon; hussar; lancer; Rough Rider
,