Hmm, someone searched for what's a group of monkeys called and got to my site, I guess I have used all of those words somewhere. Sorry that I've never answered the question. I think it's troop, but I will try to find out. I don't know why I'm answering now, the person won't be here anymore. However, I thought I would. The kind of search term you really need is "Collective Nouns", that is the name for a group of a certain thing (okay, poorly worded definition of mine, but you get the gist), but if you don't know that term then it's probably quite hard to find a useful site. Right, I searched at Google for Collective Nouns and the top page seems useful. It informs me that the correct term for a group of monkeys is: A machination of monkeys. It's quite an interesting page that, it has a whole list of collective nouns, ones that are correct are listed as submitted (the monkey one is apparently correct) however if they have been unable to find a correct one and someone has suggested a term that could be used then it is listed as suggested, for example "An addition of mathematicians (-suggested by RP)".