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An airport is an air-port. A port via the air.
(lemmy.world)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
I think it's the native speakers that don't break it down. You just take the word as a word because you learned it so young.
See? This is what happens when I assume you to be non-American. When someone assumes me to be an American, I'm apparently also the wrong one.