Q: Sentence (1) The Union action of emancipating Southern slaves.
Sentence (2) The United Nations must have the power to propose and organize action without being hobbled by irrelevant issues.. Word: action.
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A: the same meaning

Q: Sentence (1) I don't care.
Sentence (2) I don't care what he does.. Word: care.
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A: the same meaning

Q: Sentence (1) Lightning produced an unusual union of the metals.
Sentence (2) Let C be the union of the sets A and B.. Word: union.
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A:
different meanings