Problem: Sentence1: In England they call a period a stop.
Sentence2: Picasso's blue period.
Q: Does the term period mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: Your assumption that I would agree was unwarranted.
Sentence2: On the assumption that he has been injured we can infer that he will not to play.
Q: Does the term assumption mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: 12 head of big cattle and 14 head of branded calves.
Sentence2: They shot 20 head of quail.
Q: Does the term head mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: He took a course in basket weaving.
Sentence2: She prepared a three course meal.
Q: Does the term course mean the same thing in both these sentences?

Answer:
different meanings