Problem: Sentence1: I could hear the breath of the runner behind me.
Sentence2: He was fighting to his last breath.
Q: Does the term breath mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: Pittsburgh is the source of the Ohio River.
Sentence2: He spent hours looking for the source of that quotation.
Q: Does the term source mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: Their love left them indifferent to their surroundings.
Sentence2: He hadn't had any love in months.
Q: Does the term love mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: But there is always the famous example of the Smiths.
Sentence2: I profited from his example.
Q: Does the term example mean the same thing in both these sentences?

Answer:
different meanings