It comes down to familiarity with the term and the meaning of the individual words. "court martial" is a phrase many think of as a single blob with small relation to regular courts. But it is actually a martial court. A war court, to use a related though incorrect term. A court of law for the military, a "court, war" or "court of war" if you like.
Once you have that understanding, you won't pluralize as "court of wars" you'll say "courts of war." And back to the actual words, you won't say "court martials" either becuse it sounds just as bad to your ear as "court of wars."
And I object to some parts of the wikipedia article.
>>man-child men-children << I have never seen this pluralized before. What actually does the singular mean? I have a feeling that it doesn't translate to plural well.
>>manservant menservants << no, they're still manservants
>>woman doctor women doctors << Maybe. But "woman doctors" is still okay.
And I start to see some possible confusion with an alternate construction ala "eye doctor" a doctor who treats eyes. "women doctors" leaves ambiguity, though admittedly very nonstandard, about whether the doctors themselves are women or if the doctors (male or female, it is unknown) are doctors who treat women.
And also:
Two-headed compounds in which the first head has a standard plural form, however, tend to pluralize only the final head:
city-state city-states
nurse-practitioner nurse-practitioners
scholar-poet scholar-poets
I don't see "the standard plural form of the first head" in any of these having anything to do with how these were pluralized.
I also see that the two heads are not of equal weight in each case. To me, state-city evokes something very different than a city-state. English plays heavily on order to convey primacy. Think of "blue green" and "green blue". Is the former more green and the latter more blue? Or am I thinking of "blueish green" and "greenish blue?" But even these show the 'slots' we have for adjective preceeding noun.
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