Center letter: o
Outer letter: m n p r t y
Answers (56):
  promontory
  mommy
  mono
  mononym
  monotony
  moon
  moony
  moor
  moot
  morn
  moron
  motor
  motto
  noon
  norm
  onto
  pomp
  pompom
  pontoon
  pony
  poop
  poor
  poppy
  porn
  porno
  port
  potty
  prom
  promo
  prompt
  pronto
  prop
  proton
  pyro
  romp
  room
  roomy
  root
  ropy
  rotor
  tommyrot
  tony
  toon
  toot
  toponym
  toponymy
  torn
  toro
  torpor
  tort
  tromp
  troop
  trot
  troy
  typo
  tyro