>>Those make sense though. They are simple singular nouns that take an 's' for puralization. But 'water'?
>>
>>And I almost forgot, 'man - men' 'woman - women', and with 'women' we even change the pronunciation of the 'o'. What rule does that fall under, I wonder.
>
>But wasn't it written that these are regular?
>
>Yes it was, here: http://ndragan.com/lange/twouse.html - check part 2 with Roman - Romen, abdoman - abdomen etc.

Well, I know that Romen get just as constipated as anyone else, and it usually has something to do with their abdomen and appurtenances.