A piece of a sentence is called a fragment.
In the sentence "you have said your piece," "piece" is the correct word. It refers to someone expressing their opinion or viewpoint on a matter.
I have a piece of candy.
I had a piece of pie for dessert.
In the sentence "a small piece of land", the word "patch" is a noun. It functions as the subject of the sentence, referring to the small piece of land being described.
this peace of junk is a broken into piece
We each had a piece of the birthday cake.
He was able to piece together the broken gate.
The next to last sentence in a piece of writing is called the penultimate sentence.
I have found a piece of amber.
There was peace when he ate his piece of 🎂(cake).
By using it in a present type sentence. Ex: I reform my broken puzzle piece by piece.
Jody wrote a piece of an answer to a question on WikiAnswers. There was a dangerous piece of metal on the roadway. I would like a piece of pie.