焦らす[jirasu] to irritate
焦れったい[jirettai] vexing
黒焦げ[kurokoge] something burnt black
三重焦点[sanjuushouten] trifocal
想い焦れる[omoikogareru] to pine for

焼け焦げ[yakekoge] burn hole
焦がす[kogasu] to burn
焦がれる[kogareru] to yearn for
焦げる[kogeru] to burn
焦げ臭い[kogekusai] smelling (or tasting) burnt

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