Irregular plurals are words whose plurals don’t form by adding -s or -es to them. There are lots of exceptions to the rule, for example, adding -ves, compound noun plurals, using the same word.
The infographic lists them all, so go take a look. Plus, its super cute to look at.
Do you have any favorite grammar battle? Do share. As always, if you have a favorite infographic or tips to share, please feel free to comment.
Source: Irregular Plurals from Grammar.net.