Plenty and Plentiful
Incorrect : There is a plenty supply of oranges this year.
Correct: There is a plentiful supply of oranges this year.
Incorrect : I have plentiful of work to do.
Correct: I have plenty of work to do.
Note : Plenty is not an adjective, but a noun which means a large number or amount. Plentiful is an adjective which means enough in quantity.
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