LURCHER is a 7 letter word that starts with L.

1. \Lurch"er\, n. [See {Lurch} to lurk.]
   1. One that lurches or lies in wait; one who watches to
      pilfer, or to betray or entrap; a poacher.
   
   2. (Zo["o]l.) One of a mongrel breed of dogs said to have
      been a cross between the sheep dog, greyhound, and
      spaniel. It hunts game silently, by scent, and is often
      used by poachers.
   
   

2. \Lurch"er\, n. [L. lurco, lurcho, a glutton. See 1st
   {Lurch}.]
   A glutton; a gormandizer. [Obs.]