Question: Here is one sentence: The pit floor showed where a ring of post holes had been.
Here is another sentence: The room has a wooden floor.
Does the floor mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: The art of conversation.
Here is another sentence: How great thou art!
Does the art mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: I ordered two dozen doughnuts.
Here is another sentence: Pack the shirts in dozens, please.
Does the dozen mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: It will pay to wait.
Here is another sentence: He paid me 5000 pounds for the car.
Does the pay mean the same thing in the two sentences?

Answer:
different meanings