Question: Here is one sentence: They were sitting by the water's edge.
Here is another sentence: First you have to cut off the water.
Does the water mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: A drop of each sample was analyzed.
Here is another sentence: There is not a drop of pity in that man.
Does the drop mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: The product is undergoing a change in order to improve it.
Here is another sentence: This storm is certainly a change for the worse.
Does the change mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: A few words would answer.
Here is another sentence: She answered the door.
Does the answer mean the same thing in the two sentences?

Answer:
different meanings