That ship has sailed. It's 06:40 and the sun has been pouring through my windows for more than an hour :/ The part of my body that has synched up with the daylight refuses to listen to the part that needs sleep.

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"Grain silo" and "fish pond" are exactly-precisely compound nouns. It's just that English refuses to accept that it's a Germanic language and instead puts on airs. Honest languages would of course never dream of inserting pretentious spaces between the constituent parts.

I actually thought of "stone chimney" as a compound noun instead of adjective + noun when I wrote it, precisely because I wanted to mock that and really hammer home the point. Unfortunately, the two look the same in English (but not in Danish) -- and I was tired -- so I didn't catch it and replace it with a better example.