It is "piece." The original saying is "Speak your piece" meaning to have your say in the matter.
Both spellings are correct, although speaking your "peace" only makes sense in a very limited context - that of "peace", while "piece" makes sense in nearly every other context.
piece, peace
The homonym for 'peace' is 'piece'.
piece as in a piece of pizzaHe ate a piece of pizza.
The homophone for peace is piece. He ate the last pieceof pizza. A dove is a symbol of peace around the world.
The homograph of "a piece of hair" is "a peace of hair."
speak your piece
piece, peace
The homonym for 'peace' is 'piece'.
Peace Piece was created in 1958.
piece as in a piece of pizzaHe ate a piece of pizza.
It could be either. Are you otherwise talking about a peace, or a piece?
this peace of junk is a broken into piece
Dubai is a peaceful place to buy a piece of land.
There was peace when he ate his piece of 🎂(cake).
The homophone for peace is piece. He ate the last pieceof pizza. A dove is a symbol of peace around the world.
The homograph of "a piece of hair" is "a peace of hair."
Peace is the homophone for piece. Example sentences: A piece of the puzzle is lost. Let's all pray for peacein the world.