Q: Sentence (1) There has been talk about you lately.
Sentence (2) I attended an interesting talk on local history.. Word: talk.
==--==
A: different meanings

Q: Sentence (1) The president's trip will substantiate good relations with the former enemy country.
Sentence (2) The painting substantiates the feelings of the artist.. Word: substantiate.
==--==
A: different meanings

Q: Sentence (1) Paul laughed a cheerful laugh.
Sentence (2) She laughed her excitement.. Word: laugh.
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A:
the same meaning