Center letter: o
Outer letter: c g i j n u
Answers (31):
  jouncing
  cocci
  cocoon
  cocooning
  coin
  coining
  conic
  conjoin
  conjoining
  conning
  cooing
  going
  gong
  gonging
  goon
  gouging
  icon
  iconic
  ionic
  jingo
  jogging
  join
  joining
  junco
  noggin
  noon
  noun
  nuncio
  ongoing
  onion
  union