Problem: Sentence1: The word is a basic linguistic unit.
Sentence2: The reduced the number of units and installations.
Q: Does the term unit mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: To start a rumour.
Sentence2: Start a new job.
Q: Does the term start mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: The floor of the cave.
Sentence2: The floor of a cave served the refugees as a home.
Q: Does the term floor mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: A sense of self.
Sentence2: A sense of happiness.
Q: Does the term sense mean the same thing in both these sentences?

Answer:
the same meaning