Riffler is a 7 letter English word. It's valid Scrabble word worth 13 points. It's valid Words with friends word worth 14 points.
You can make 76 anagrams from letters in riffler (effilrr).
1790-1800; perhaps German riffel(n) to cut grooves into (an object) + -er1; compare French rifloir a kind of file (see rifle2<