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 noun does not have the meaning of its component words, but only some related meaning (usually either a pars pro toto meaning or a metaphorical meaning). Those are true compound nouns, not just abbreviated sequences of words from which the grammatical markers have been omitted.

Such compound words were very frequent in Ancient Greek, from where they have been inherited in the scientific and technical language, where they have been used to create names for new things and concepts, e.g. arthropod, television, phonograph, basketball, "bullet train" and so on.

This kind of compound words are almost never translatable, but they are frequently borrowed from one language to another and during the borrowing process sometimes the component words are translated, but the result is not a translated word, it is a new word that is added to the destination language.