Compounds of 穆

• 清穆
  (n,adj-no) gentle and pure (used in letters to celebrate the health and happiness of the addressee)
• 穆々
  (adj-t,adv-to) (arch) peaceful and lovely
  humble and dignified
• 穆穆
  (adj-t,adv-to) (arch) peaceful and lovely
  humble and dignified