Center letter: l
Outer letter: g h i n r t
Answers (37):
  thrilling
  giggling
  gill
  gilling
  gilt
  girl
  glint
  glinting
  grill
  grilling
  highlight
  highlighting
  hill
  hilling
  hilt
  light
  lighting
  lightning
  lilt
  lilting
  lining
  lint
  niggling
  nightlight
  riling
  rill
  thrill
  tiling
  till
  tilling
  tilt
  tilth
  tilting
  tingling
  titling
  trill
  trilling