Sky noun – The expanse of air surrounding the earth. Vault of heaven and sky are semantically related. in heavens topic. In some cases you can use "Vault of heaven" instead a noun "Sky". literary substitute Nearby Words: skyline, skyway, skying, skye, skyer
Vault of heaven noun – The apparent surface of the imaginary sphere on which celestial bodies appear to be projected. Sky and vault of heaven are semantically related. You can use "Sky" instead a noun phrase "Vault of heaven".