Earlier quoted context omitted.
That's just a difference in orthography. English could easily have had an orthographic standard where we write "compoundnoun" for compounds. This is in contrast with a language like French, where compound nouns are relatively rare. Compare English "Olive oil" and German "Olivenöl" with French "huile d' olive". In French you need to have a preposition to combine the two nouns, whereas English and German do noun-noun c…
You are right but neither yours nor those of the previous posters are good examples of compound nouns. These examples have just the meanings of a noun + adjective or of a noun + noun in genitive case, where some languages are lazier than others and omit the markers of case or of adjectival derivation from noun, which are needed in more strict languages. There are also other kinds of compound nouns, where the compound…
The example that people often quote from German is “kummerspeck” which would literally translate as “grief bacon”, but means weight you put on through comfort eating having gone through a bereavement or other trauma.