Irregular nouns can make their plural form by;

a. adding -es to the noun that ends in -s, -ss, -sh, -ch, -x, or -z,
b. adding -es to the noun that ends in -o, add -es to make it plural.
c. adding s to the noun that ends with -f or -fe, then changed to -v or -ve
d. changing their spelling or adding a different ending to form their plural ​