Question: Here is one sentence: My ambition is to own a helicopter.
Here is another sentence: His ambition is to own his own business.
Does the ambition mean the same thing in the two sentences?

Answer: the same meaning

Question: Here is one sentence: He followed on foot.
Here is another sentence: The foot of the mountain.
Does the foot mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: There was a grain of truth in what he said.
Here is another sentence: We stored a thousand tons of grain for the winter.
Does the grain mean the same thing in the two sentences?

Answer: different meanings

Question: Here is one sentence: Track a missile.
Here is another sentence: I tracked prints.
Does the track mean the same thing in the two sentences?

Answer:
different meanings