For example HOOVES is the plural of HOOF and also of HOOVE (a disease of cattle). Since the second meaning seems very obscure, HOOVES is allowed. In fact even GOES comes into this category, because there is a word GOE - apparently an archaic version of GO - but it would be ludicrous to exclude GOES on that account.
This the reason both STIE and STIES are allowed (an example that comes up in the puzzle quite often), STIES as the plural of STY. I presume STIE is an obscure variant of STYE.
Alan, as far as brief goes...You mentioned that it is usually an adjective with no plural. This is true, however it can be used in the sense of a legal brief as well. In this instance, it does have a plural - legal briefs.
If it ain't broke don't fix it....
Because some rare words are firmly stuck in my nozzle now and i play them like a common word..if you change it then i won't have a clue what the hell i'm doing!!!
If it ain't broke don't fix it....
I would rather you considered each suggestion on it's own merits, as now.
Each of these words seems to be a plural without a corresponding singular form in general use. In some cases, the word formed by dropping off the S has an unrelated meaning (boxer / boxers). In other cases, it is related, but not quite the same (nylon is not normally used for a single stocking, but for the material from which nylons are made). Sometimes the word without the S is used in an adjectival way (pajama top / pyjama top).
??? what about axes as the plural of axis?