Center letter: t
Outer letter: a d h i n o
Answers (42):
  nationhood
  addition
  annatto
  annotation
  anoint
  anti
  attain
  data
  dhoti
  dint
  ditto
  donation
  doth
  hath
  hatha
  hint
  hoot
  idiot
  initiation
  into
  intonation
  iota
  natant
  nation
  ninth
  notation
  notion
  oath
  onto
  tahini
  taint
  tannin
  tattoo
  than
  that
  thin
  tint
  titan
  toad
  toon
  toot
  tooth