Water? You mean like ocean, lake, river, sea, pond? I guess if you want to get into swamps and sloughs... rivulet, stream, run, rill, cascade... I don't think I could go on for an hour, though. Let me hear your 24 (which is the highest number of words for snow found in an arctic indigenous culture).
That book does look cool. I think whole language aligns with the "don't talk down to your kids" thing that people think they do. I guess I might see where it goes along with the Montessori philosophy, that education is about discovery of the self more than change. It has to be both, really, getting back to that whole "wisdom to know the difference" thing.