Q: Sentence (1) It was a mountainous area.
Sentence (2) It was a closed area of employment.. Word: area.
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A: different meanings

Q: Sentence (1) He was well aware of the richness of his own appearance.
Sentence (2) The richness all around unsettled him for he had expected to find poverty.. Word: richness.
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A: different meanings

Q: Sentence (1) He is a lawyer with a sports background.
Sentence (2) The lawyer had a background in computer science.. Word: background.
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A:
the same meaning