grueso - thick, fat, large, heavy
  la greña - tangle of hair, matted hair, mop of hair
  griego - Greek (as either a noun or adjective)
  gatillo - trigger of a gun
  el gazapo - young rabbit, typographical error or...
  godo, goda - Gothic, Goth
  el girasol - sunflower
  la grulla - crane (type of bird)
  el gaucho - gaucho (the \"cowboy\" of Argentina,...
  la gaviota - seagull
  el guajolote - turkey
  gualdo - yellow, golden
  guapo - good-looking, attractive, handsome,...
  el guardabosque, la guardabosque - forest ranger, park ranger
  gafe - jinxed
  la gala - big show (often one put on for...
  la gomina - gel (especially hair gel)
  el germen - germ (in most usages)
  la granada - pomegranate, grenade
  el glaciar - glacier