sky

nouns

the atmosphere and outer space as viewed from the earth
sky
is a part of
the 3rd planet from the sun; the planet we live on
"the Earth moves around the sun"; "he sailed around the world"
is a type of (narrower)
the envelope of gases surrounding any celestial body

verbs

throw or toss with a light motion
"flip me the beachball"; "toss me newspaper"