Troop \Troop\, v. t.

To troop the colors or colours (Mil.), in the British army, to perform a ceremony consisting essentially in carrying the colors, accompained by the band and escort, slowly before the troops drawn up in single file and usually in a hollow square, as in London on the sovereign's birthday. Trooper \Troop"er\, n. A mounted policeman. [Australia]

Note: The black troopers of Queensland are a regiment of aboriginal police, employed chiefly for dispersing wild aborigines who encroach on sheep runs.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Trooper \Troop"er\, n. A soldier in a body of cavalry; a cavalryman; also, the horse of a cavalryman.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Grouper \Group"er\, n. [Corrupted fr. Pg. garupa crupper. Cf. Garbupa.]

(Zo["o]l.)
   (a) One of several species of valuable food fishes of the genus Epinephelus, of the family Serranid[ae], as the red grouper, or brown snapper (E. morio), and the black grouper, or warsaw (E. nigritus), both from Florida and the Gulf of Mexico.
   (b) The tripletail (Lobotes).
   (c) In California, the name is often applied to the rockfishes. [Written also groper, gruper, and trooper.]

Source: Webster's Revised Unabridged Dictionary (1913)