<p>
> There's a debate to be had about whether or not all possible N+N<br
/>> compounds are meaningful to some degree...</p><p>An N+N compound in
English means that there is some implicit relationship that the speaker
assumes the audience knows.</p><p>One of my favorite examples is 'steamer
duck', which is not a kind of duck that is cooked by steaming (as steamer
clams).</p><p>Instead, a steamer duck is one that flaps its wings like a
paddle-wheel steamer when it takes off.</p><p>John Sowa</p>