 Also, Hobbits, just like water, resists pluralization. For the former, this is because Hobbits is already plural: ‘Hobbitses’ does not make sense. Water cannot be pluralized and retain its standard reference, since ‘waters’ either means kinds of water, or different bodies of water (e.g., lakes, rivers, pools, seas, rather than numerous water per se, which doesn’t make sense unless used in a technical or stipulative way). One way to explain this is to suppose that water is already plural.