Question: Here is one sentence: Anne Boleyn placed her head on the block and awaited her execution.
Here is another sentence: The pyramids were built with large stone blocks.
Does the block mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: If you hurry you'll catch the post.
Here is another sentence: This military post provides an important source of income for the town nearby.
Does the post mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: The controversy brought clearly into focus an important difference of opinion.
Here is another sentence: The focus of activity shifted to molecular biology.
Does the focus mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: The quality of students has risen.
Here is another sentence: Quality of life is usually determined by health, education, and income.
Does the quality mean the same thing in the two sentences?

Answer:
the same meaning