Question: Here is one sentence: Can I buy you a drink?
Here is another sentence: Drink was his downfall.
Does the drink mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: They resisted every effort on his part.
Here is another sentence: It requires vigilance on our part.
Does the part mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: There was a chemical reaction of the lime with the ground water.
Here is another sentence: In this reaction, the acid and base will neutralize each other, producing a salt.
Does the reaction mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: A sense of happiness.
Here is another sentence: A sense of security.
Does the sense mean the same thing in the two sentences?

Answer:
the same meaning