Center letter: h
Outer letter: a c d e i k
Answers (39):
  chickadee
  ache
  ached
  acidhead
  ahead
  cache
  cached
  chad
  chai
  check
  checked
  cheek
  chia
  chic
  chica
  chichi
  chick
  chide
  chided
  dacha
  deadhead
  deadheaded
  each
  hack
  hacked
  haka
  hake
  head
  headache
  headed
  heck
  heed
  heeded
  hick
  hide
  hied
  hike
  hiked
  khaki