Question: Here is one sentence: I really want to sing in the school choir.
Here is another sentence: She was singing while she was cooking.
Does the sing mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: Pottery of this cast was found throughout the region.
Here is another sentence: The delicate cast of his features.
Does the cast mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: The coast is clear.
Here is another sentence: The children lined up for a coast down the snowy slope.
Does the coast mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: The war against crime.
Here is another sentence: The "war on terror" is a campaign against terrorist crime.
Does the war mean the same thing in the two sentences?

Answer:
the same meaning