Double plurals Multiplicative Plurals Multiplicate plurals are actually compounds of a number and a singular noun. Most will be listed in a standard dictionary. If you can't find one, however, simply split it into its two pieces and look up the noun part, unmutating if necessary. Collective Plurals Welsh has a number of collective nouns which tend to represent things that are more often referred to as groups or collections than as individuals. Nearly all of these words represent animals, fur or feathers, vegetation, fruits, seeds, and similar things from nature.
Dictionaries are inconsistent about which form they list.
Some will give the singular and some the plural. Internal vowel changes, as described in the previous installments, can also occur when the ending is added or removed. The plural ending must be removed and the singular added to find the dictionary entry. Although it probably seems, with all these plural endings and vowel changes, that just about all Welsh plurals are irregular, in fact they do follow fairly basic rules. It's just that Welsh has a lot more rules than most languages.