Q: Sentence (1) Don't drift from the set course.
Sentence (2) The stock market drifted upward.. Word: drift.
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A: different meanings

Q: Sentence (1) I hope I can keep up this streak of accomplishments.
Sentence (2) I was on a winning streak until the fourth game, where I was dealt terrible cards.. Word: streak.
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A: the same meaning

Q: Sentence (1) The word "kerosine" is a variant of "kerosene".
Sentence (2) A variant of the same word.. Word: variant.
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A:
the same meaning