Cases of word usage

1) a thin layer of covering (coating)

2) the outer layer of grey matter of the brain (cortex)

3) the outer layer of the skin (epidermis)

4) a thin long mark on a surface; to attach an inside layer of material to (a bag, box, drawer etc or to clothing) (line)

5) (a layer of) material added to the inside of something (lining)

6) a soft, thin layer of (skin) tissue or covering (membrane)

7) the layer of hard substance over the outer tip of a finger ('finger-nail') or toe ('toe-nail'); a piece of metal, pointed at one end and with flat head at the other, (to be) hammered into articles to hold them together etc; to get (a person's) attention (nail)

8) that part of a layer (of rock etc) which can be seen (outcrop)

9) a layer of wood or thickness of cloth (ply)

10) a grey layer of dirty substances that forms on the surface of water, e.g. in a bath, a pond etc; the worst kind of people (scum)