Blue
Blue noun - The expanse of air surrounding the earth.
Usage example: the plane flew off into the blue and was never seen again
Sky is a synonym for blue in heaven topic. In some cases you can use "Sky" instead the word "Blue" as a noun or an adjective, when it comes to topics like wonderful feeling.
Both words in one sentence
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In the last few seasons of Teenage Mutant Ninja Turtles, the sky is red instead of its normal blue.
Source: Alien Sky -
After Lord Yatterman had been defeated, however, the sky changes to a clear blue mid-morning sky.
Source: Anime / Yatterman Night -
Used in Pitch Black, though it's justified by making one of the planet's suns a blue giant and it's only blue when that sun's in the sky.
Source: Unnaturally Blue Lighting
Cite this Source
Sky and Blue. (2016). Retrieved 2022, June 28, from https://thesaurus.plus/related/blue/sky
Blue & Sky. N.p., 2016. Web. 28 Jun. 2022. <https://thesaurus.plus/related/blue/sky>.
Sky or Blue. 2016. Accessed June 28, 2022. https://thesaurus.plus/related/blue/sky.
Google Ngram Viewer shows how "blue" and "sky" have occurred on timeline