> "Grain silo" and "fish pond" are exactly-precisely compound nouns. Eeeh, not exactly in English. English does make some distinction between fully compounded

> "Grain silo" and "fish pond" are exactly-precisely compound nouns. Eeeh, not exactly in English. English does make some distinction between fully compounded words and noun phrases, especially in rules of production. In a newer phrase like "wind farm", you can swap in more or less any noun you like, even if it doesn't make a lot of sense: "mud farm", "rock farm", "hair farm"... there's some rule like "substance + farm = a farm that produces that substance". With a word like "bedroom", you can get "bathroom", but not so much "deskroom"; there's no general rule like "furniture + room = room where that furniture is found". The space (in cases where it's pronounced) is kinda your hint there. Anyway... I still don't believe in grammar, but y'all have mounted a spirited defense of the traditional analysis. I'm sorry I tried to say everything's an adjective :)