Problem: Sentence1: It worked up to right now.
Sentence2: Now is a good time to do it.
Q: Does the term now mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: Leave the room.
Sentence2: She wants to leave.
Q: Does the term leave mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: He doesn't care about how / whether she comes.
Sentence2: I don't care.
Q: Does the term care mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: The life of this milk carton may be thousands of years in this landfill.
Sentence2: Get a life.
Q: Does the term life mean the same thing in both these sentences?

Answer:
different meanings