The term 'walks heavily' can be described by several words, all of which have six or five letters. These words include 'tromps', 'tramps', 'SLOGS', 'PLODS', 'clomps', and 'stamps'. 'Tromps' means to walk heavily and noisily, while 'tramps' means to walk with a heavy, dull sound. 'SLOGS' is a verb meaning to walk slowly and laboriously, and 'PLODS' is similar in meaning. 'Clomps' is a verb meaning to walk heavily and clumsily, and 'stamps' is a verb meaning to walk heavily and firmly.