蘊奥 （ウンノウ） inner mysteries (of a field of study), secrets

蘊蓄 （ウンチク） great erudition, extensive knowledge, vast stock of knowledge

中蘊 （チュウウン） bardo, state (or period) of intermediate existence between one's death and rebirth (in Japan, 49 days)

行蘊 （ギョウウン） formation of volition, aggregate of volition