Center letter: r
Outer letter: b g i n o w
Answers (51):
  borrowing
  browning
  boor
  boring
  born
  boron
  borrow
  bribing
  brig
  bring
  bringing
  brining
  brio
  brow
  brown
  gorging
  gorgon
  goring
  grin
  grinning
  grog
  groin
  grow
  growing
  grown
  ignoring
  inborn
  ingrown
  iron
  ironing
  nigiri
  noir
  nori
  origin
  ribbing
  ribbon
  ribboning
  rigging
  rigor
  ring
  ringing
  robbing
  robin
  robing
  rowing
  wiring
  worn
  wring
  wringing
  wrong
  wronging