1. Corsair (n.) "government-sanctioned freebooter of the seas," 1540s, from French Corsaire (15c.), from Provençal cursar, Italian corsaro, from Medieval Latin cursarius "pirate," from Latin cursus "course, a running," from currere "to run" (from PIE root *kers-"to run")

2. 1400, also brigaunt, "lightly armed irregular foot-soldier," from Old French Brigand (14c.), from Italian brigante "trooper, skirmisher, foot soldier," from brigare "to brawl, fight" (see brigade).Sense of "robber, freebooter, one who lives by pillaging" is earlier in English (late 14c.), reflecting the lack of distinction between professional mercenary armies and armed

3. As nouns the difference between filibuster and Cloture is that filibuster is a freebooter, or mercenary soldier while Cloture is (legal) in legislative assemblies that permit unlimited debate (filibuster); a motion, procedure or rule, by which debate is ended so that a vote may be taken on the matter for example, in the united states senate, a three-fifths majority vote of the body is required