Plate
Dish
noun
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it should use the kun'yomi reading which is also the reading you learned when you learned the kanji.
皿はキッチンキャビネットの中にあります。
Plates are in the kitchen cabinet.
広いテーブルの上に大きいお皿がたくさんあった。
There were many large dishes on a big, wide table.
この皿、下げてもらってもいいですか？
Could you take this plate, please?