Problem: Sentence1: I shall be writing to you soon.
Sentence2: The postman has been today, but my tickets have still not yet come.
Q: Does the term be mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: The houseguests had to camp in the living room.
Sentence2: Can we go camping again this summer?
Q: Does the term camp mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: Use your head!
Sentence2: I used to get things done.
Q: Does the term use mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: They applied for an extension of the loan.
Sentence2: The extension of 'satellite of Mars' is the set containing only Demos and Phobos.
Q: Does the term extension mean the same thing in both these sentences?

Answer:
different meanings