21. The " universal packager " likewise describes how mass nouns are understood when they are used as countable nouns. 22. Anonymous ( used as a mass noun ) is a loosely associated international network of activist and hacktivist entities. 23. Common nouns are in turn divided into concrete and abstract nouns, and grammatically into count nouns and mass nouns . 24. There is often confusion about the two different concepts of " collective noun " and " mass noun ". 25. "But until today's article in the Globe I had never heard the word used as anything but a mass noun . 26. Khmer nouns are divided into two groups : mass nouns , those which take classifiers, and specific nouns, which do not. 27. These are required for counting in the case of mass nouns , and some can also be used with count nouns. 28. Mass nouns don't take the definite article " unless " one is trying to make some specific statement about it.29. However, some Russian mass nouns have developed a distinct partitive case, also referred to as the " second genitive case ". 30. The word " of " is used in ( 3 ) to mark the mass noun water is partitioned into gallons.