Compounds of 門外

• 門外
  (n) outside a gate
  beyond one's area of expertise
• 専門外
  (n,adj-no) outside of one's area of expertise
• 門外漢
  (n) outsider
  layman
  amateur
  (P)
• 門外不出
  (n,adj-no) (treasuring something by) never taking (it) off the premises