By Pipno
When the word ends in Z, replace it with an X
When the word ends in E, replace it with an IS
When the word ends in O, replace it with an US
Else, just add and S.
Plural of Chitab
(Book (African dialect))
Plural of Rapaz
(Young man)
Plural of Fungo
(Fungus)
Plural of Telephone
(Telephone)