What’s the Plural of Addendum?
Addendum has two plural noun forms: both addenda and addendums are correct, though the former is the original Latinate pl. n. form.
Grammarflex »
November 22, 2022
What’s the Plural of Child?
The plural of child (which is singular), is children (plural noun). Like man and woman, children is an irregular plural noun in English since it doesn’t end in -s/-es.