I love the way Japanese words (especially old, obscure ones) can be highly specific. Here are some great examples:
初空 (hatsusora: sky on New Year’s morning) beginning + sky
Lovely, isn’t it? This can also be pronounced hatsuzora.
東京上空 (Tōkyō jōkū: the skies of Tokyo) Tokyo (1st 2 chars.) +
above + skyEvery vowel in Tōkyō jōkū is elongated!
制空権 (seikūken: mastery of the air) control + air + rights
This compound is a military term for being well positioned to bomb enemy territory. If you didn’t know that, you might think it had to do with a megalomaniac’s desire to control even the air we breathe!