Examples: boy, girl, book, church, box
Plural Noun Definition: When a noun means more than one, it is said to be plural.
Examples: boys, girls, books, churches
The plural of nouns is usually formed by adding - s to a singular noun.
Nouns ending in s, z, x, sh, and ch form the plural by adding - es.
If you add - s to such nouns as fox, bush, and bench, you will find that you cannot pronounce them without making an additional syllable. This is why such nouns form the plural by adding - es.