Grass Trimmers are known by various names..... Strimmers, String Trimmers, Line Trimmers, Weedeaters, Weedwhackers, Garden Trimmers, or Brushcutters! They all use flexible nylon line to cut grass and weeds.  The easiest way to distinguish them is by the 2 main names - Strimmer or Trimmer: Light weight domestic machine with a bend in the drive shaft.  Brushcutter: Heavy Duty machine with high power and a straight drive shaft. Designed for commercial or frequent use. Can also be fitted with a metal blade or other cutting tools.