Question: Here is one sentence: A school of small glittering fish swam by.
Here is another sentence: The divers encountered a huge school of mackerel.
Does the school mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: I couldn't shake the car that was following me.
Here is another sentence: The bad news shook her hopes.
Does the shake mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: I am a British subject.
Here is another sentence: A moving picture of a train is more dramatic than a still picture of the same subject.
Does the subject mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: Reduce a problem to a single question.
Here is another sentence: The cells reduce.
Does the reduce mean the same thing in the two sentences?

Answer:
different meanings