(uncommon) light, illumination / (uncommon) a light, a lamp / light, not dark (as of a color, as in light blue) / light, not heavy (as of a physical thing, as in lightweight)

light (casual)

(astronomy) a black hole

black coffee (coffee served without cream or milk)

a black bass

"black company"; an exploitative firm that abuses employees or offers poor working conditions

ridiculous (oppressive, etc.) school regulation

road covered in black ice

special illumination of monuments, towers, trees, etc. at night; architectural floodlighting

turning off of lights