Praat Language Lab :: Introduction

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Complex plural nouns formed by adding the plural ending to a noun with a more general one.
When a complex noun includes, as one of the two elements of the man or woman to refer to sex, then both elements of compound nouns take the plural form:
man-servant, men-servants
woman-writer, women-writers
Nouns that are used only in the singular.
As a general rule, the nouns are singular form only if they refer to items that cannot be counted as separate units. Such nouns are called conditionally uncountable.
Phenomena, radii, nuclei, loci, data.
Nouns are real, indicating a substance or material used, usually in the singular, for example:
iron, steel, water, air, butter.
However, the real nouns may also be used in the plural when they refer to varieties of substances.
Abstract nouns are used, usually in the singular. These nouns include: hardness, stiffness, courage, friendship, music, time, success, and so on.
Note. In the concrete and abstract concepts of individualization nouns denoting them acquire a different meaning and can be used in the plural.
Nouns denoting different counting values may be in the form of both numbers, but in combination with quantitative numerals are used only in the singular: five dozen apples, three score years, etc.
If these nouns take a more general meaning of plurality, i.e., indicate a large number without a precise quantitative value, they, like ordinary nouns take the plural form. In this case, they do not follow the name of the numeral.
Some concrete nouns are used as counting words are not used in the plural form. These nouns include: stone, used to indicate the measures a person's weight or a large animal (approximately 6.36 kg) - a man of 12 stone; head, used for counting animals.
If the group is a numeral plus a noun is the definition of another noun, the noun that follows the numeral, used only in the singular: a five-year plan, a two-year child.