sky, sea, minimal
In their language, the Inuit have, according to various sources, around fifty words for snow. A study of the Sami language of Norway, Sweden and Finland, concludes that the language has around 180 snow and ice related words (and as many as 1000 different words for reindeer).
Many languages, such as Vietnamese, Thai, Chinese, Korean and Japanese, use one word to denote what we call the colours blue and green.
In English and other Western languages we often associate the two words sky and blue together.
Today the sky is grey. Although now I look at it you could describe it as silver, or off-white, or shades of grey. Nor is it uniform - there are lighter patches, quite dark patches and, here and there, tinges of purple.
And here are a couple of pictures of the sky taken on another day, some months ago, on a walk somewhere between Shoreham and Flinders. One of them has a stretch of sea at its base.