月刊
  げっかん
  noun (common) (futsuumeishi)
  nouns which may take the genitive case particle `no'
  monthly publication
  monthly issue
  ◄ ►
  月間
  げっかん
  noun (common) (futsuumeishi)
  noun or verb acting prenominally (other than the above)
  month-long period
  (during) month
  ◄ ►