Center letter: h
Outer letter: a c e i m t
Answers (57):
  mathematic
  thematic
  ache
  ahem
  attach
  attache
  cache
  cachet
  catch
  chai
  chat
  cheat
  cheetah
  chia
  chic
  chica
  chichi
  chime
  chit
  chitchat
  each
  etch
  ethic
  hamachi
  hamate
  hatch
  hatchet
  hate
  hath
  hatha
  heat
  heath
  hectic
  hematite
  heme
  hitch
  itch
  machete
  mahatma
  mahimahi
  match
  matcha
  math
  meth
  tach
  teach
  tech
  techie
  teeth
  teethe
  that
  thatch
  thee
  them
  theme
  theta
  tithe