The best replacement for thorn is spine.

The best alternatives to thorn are rated as following:
★★★★★  spine
★★★★  koga
★★★  roberto duran
★★★  torn
★★★  lht
★★★  splinter
★★  eth
★★  prickle
★  surly

Your alternative for thorn is not listed? Suggest!
Speaking about thorn, one probably shouldn't forget about rose lyrics.

Other search terms related to thorn and their ratings are:
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Google Trends

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thorn
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