Center letter: a
Outer letter: g i k n o y
Answers (35):
  okaying
  again
  aging
  agog
  agony
  akin
  angina
  anion
  annoy
  annoying
  anon
  gaga
  gagging
  gain
  gaining
  gang
  ganging
  gonna
  kayak
  kayaking
  koan
  naan
  nagging
  naggy
  nana
  nanny
  nannying
  nonagon
  oaky
  okay
  yakking
  yang
  yank
  yanking
  yoga