Center letter: g
Outer letter: h i n o c e
Answers (41):
  echoing
  chignon
  chinning
  cinching
  cocooning
  coining
  congee
  conning
  cooing
  egging
  eggnog
  engine
  gene
  genie
  genii
  ghee
  gigging
  ginning
  gnocchi
  going
  gone
  gong
  gonging
  goon
  henge
  high
  hinge
  hinging
  hoeing
  hogging
  honing
  icing
  inching
  inning
  neigh
  neighing
  nigh
  noggin
  noogie
  ogee
  ongoing