The plural of nouns
The plural of countable nouns
Nouns that you can count as separate items are called countable nouns. Take for example the word coin: you can have one coin, two coins, three coins, four coins and so on.
There are some exceptions, however.
There are nouns that end with the sound /dʒ/ as in sandwich, witch, the sound /s/ as in class, glass, the sound /z/ as in blouse or the sound /ks/ as in box, fox. You can hear the sound endings when you speak the words out loud.