tirailleur means an infantry soldier. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Why “tirailleur” is a great word
TIRAILLEUR — [Noun] A light infantry skirmisher, historically often a colonial soldier recruited by the French army. Borrowed from French tirailleur, from tirailler ('to skirmish, to shoot sporadically'), a frequentative of tirer ('to pull, to shoot'). Earliest known use in the late 1700s. Unlike a 'grenadier,' an elite heavy infantryman, or a 'regular' line soldier in close formation, the tirailleur operated in loose, dispersed order ahead of the main battle line. He is the fleeting shadow in the tree-line, the crack of a single musket from a wheat field, and the silhouette flitting between trees in a distant gorge—a weaponization of distance and terrain that casts the individual, not the mass, as the unit of tactical consequence.
Etymology
Borrowed from French tirailler (“to skirmish”).