robber
UK /ˈɹɒb.ə(ɹ)/ · US /ˈɹɑ.bɚ/ noun
Forms robbers
Etymology
Inherited from Middle English robbour, robbere, either directly taken from or from a calque of Old French robeor. Equivalent to rob + -er.
Compare reaver (“robber, plunderer”), a native English word derived from Proto-Germanic *raubārijaz that is ultimately of more or less the same composition as robber. And compare rover (“a pirate”), another word of the same composition.
Webster’s 1913
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “robber”, CC BY-SA 4.0. Details