Biblical: dark, darkness: 1) absence of light: chu tshod gsum pa'i bar du yul thams cad mun pas 'thibs/ darkness came over all the land until the third (NIV: sixth) hour (Mt. 27:45), 2) figurative darkness, especially moral darkness, sin, or the lack of God's revelation: mun par sdod pa/ those who live in darkness (Mt. 4:16), 'od de mun pa'i nang du shar/ the light shines in the darkness (Jn. 1:5), phan med kyi mun pa'i bya ba/ fruitless deeds of darkness (Eph. 5:11), mun pa 'das shing yang dag pa'i 'od shar/ the darkness is passing and the true light is already shining (1 Jn. 2:8).
Buddhist: 1) In Bst. writing, darkness is usually equated with ignorance: gti mug gi mun pa/ the darkness of ignorance (TRC 166), mun bskal/ [lit. dark age] an age in which there is no Buddha (SGC 634), mun gling / a place where Buddhism has not spread (SGC 634); 2) may also be used figuratively: sems la mun pa babs pa lta bu'i rmugs pa/ torpor like darkness falling on the mind (TRC 186).
[lit. dark + black]
Biblical: blackest darkness, pitch black: phyi rol gyi mun nag the darkness outside (Mt. 22:13), mun nag dang /,,smag rum dang /,,rlung drag darkness, gloom, and storm (Heb. 12:18), de'i rgyal khams mun nag tu byas nas/ his kingdom was plunged into darkness (Rev. 16:10).
Buddhist: khang pa mun nag zhig a pitch-dark house (TRC 167).
Secular: spyi tshogs kyi mun nag social darkness (SBC-1 62).