陰門 is read as いんもん (immon) and means vulva.
いんもん
immon
いんよう
cosmic dual forces
いんき
spirit of yin
いんせい
negative (result)
かげぐち
malicious gossip
かげ
gloom (in someone's expression, nature, etc.)
いんぼう
conspiracy
かげり
shadow (e.g. on someone's happiness)
いんえい
nuance
いんしつ
shady and damp
いんいおん
anion
いんせいはんのう
negative reaction (in patient)
いんせいだい
Cryptozoic (period)