la gansada - something silly or inconsequential
  el guisante - pea
  el garrote - club, stick, tourniquet, garotte,...
  el granizo - hail
  el granito - granite, item made from granite,...
  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