GITTERN is a 7 letter word that starts with G.

1. \Git"tern\, n. [OE. giterne, OF. guiterne, ultimately
   from same source as E. guitar. See {Guitar}, and cf.
   {Cittern}.]
   An instrument like a guitar. ``Harps, lutes, and giternes.''
   --Chaucer.
   
   

2. \Git"tern\, v. i.
   To play on gittern. --Milton.