お歯黒[ohaguro] tooth blackening
暗黒期[ankokuki] eclipse period
暗黒時代[ankokujidai] Dark Ages
暗黒大陸[ankokutairiku] Dark Continent (i.e. Africa)
黒い[kuroi] black

黒い霧[kuroikiri] thick fog
黒くする[kurokusuru] to blacken
黒ずむ[kurozumu] to blacken
黒っぽい[kuroppoi] dark

麹黴[koujikabi] yeast plant
青黴[aokabi] blue mold
黴菌[baikin] germ
黴臭い[kabikusai] smelling of mold
黴雨[baiu] rainy season

黴毒[baidoku] syphilis
黴る[kabiru] to become moldy or musty (mouldy)
黒黴[kurokabi] black mold
黴が生える[kabigahaeru] to get moldy