Cases of word usage

1) (a mass of) white or grey water vapour floating in the sky (cloud)

2) a flash of bright light produced by natural electricity between clouds in the sky or clouds and the ground, often with thunder (lightning)

3) s group of very distant stars, mass of gas, seen in the night sky as a patch of light (nebula)

4) a building from which the sky can be observed (observatory)

5) above one's head; in the sky (overhead)

6) of sky (skies)

7) a kind of small bird that sings as it flies up into the sky (skylark)

8) frozen water falling from the sky in soft, white pieces (snow)

9) any one of the points of light seen in the sky at night; a person who is famous as a singer, actor, actress etc (star)

10) the part of the sky directly overhead; the highest point (of one's fame, fortunes etc) (zenith)