Center letter: m
Outer letter: a i l n t u
Answers (68):
  illuminati
  matutinal
  allium
  alum
  alumina
  aluminum
  alumna
  alumni
  anima
  animal
  autumn
  autumnal
  ilium
  imam
  lama
  lamina
  laminal
  lima
  liminal
  limit
  limn
  llama
  mail
  mailman
  maim
  main
  maintain
  mall
  malt
  mama
  mamma
  mammal
  mammalian
  mania
  manila
  manna
  manta
  mantilla
  manual
  manumit
  maul
  militant
  militia
  militiaman
  mill
  mini
  minim
  minima
  minimal
  minimum
  mint
  minutia
  mitt
  mull
  mutant
  mutt
  mutual
  muumuu
  tantalum
  tatami
  titanium
  tumult
  ultima
  ultimata
  ultimatum
  umami
  umlaut
  unman