To make a noun plural, we use an orthographic convention of -w.
mɔgɔkɔrɔba —> mɔgɔkɔrɔbaw
elderly person —> elderly persons
There are no other situations where you will see a word that ends in w so anytime you see it as the last latter of word, you know that it’s a noun in the plural!
In terms of pronunciation, the plural marker is an [u] sound.
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The plural -w [u] is clearly a truncation of an older plural marker -lu/nu that is preserved in certain words and in some Manding varieties. For instance:
The emphatic third person plural pronoun olu (they)