Q: Sentence (1) The fire-light gave a richness of coloring to that side of the room.
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) Catch fire.
Sentence (2) The trees caught quickly in the dry wind.. Word: catch.
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A: the same meaning

Q: Sentence (1) He was at the top of his form.
Sentence (2) The team was off form last night.. Word: form.
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A:
the same meaning