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.
We each had a piece of the birthday cake.
this peace of junk is a broken into piece
He was able to piece together the broken gate.
Example sentence - The combustion engine is an amazing piece of machinery.
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.