Q: Sentence (1) That mechanic's a bum -- he couldn't fix a yo-yo.
Sentence (2) Fred is becoming a bum -- he's not even bothering to work more than once a month.. Word: bum.
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A: the same meaning

Q: Sentence (1) He doesn't know how to use a computer.
Sentence (2) Use this knife to slice the bread.. Word: use.
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A: the same meaning

Q: Sentence (1) Block a nerve.
Sentence (2) Block a garment.. Word: block.
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A:
different meanings