Is there a word for someone who is a killjoy yet also "The voice of caution?"

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Music by Eric Matyas
https://www.soundimage.org
Track title: Realization

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Chapters
00:00 Is There A Word For Someone Who Is A Killjoy Yet Also &Quot;The Voice Of Caution?&Quot;
00:33 Answer 1 Score 10
01:14 Answer 2 Score 9
01:34 Answer 3 Score 8
02:04 Accepted Answer Score 5
02:41 Answer 5 Score 2
02:55 Thank you

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Full question
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Tags
#singlewordrequests #phraserequests #eponyms

#avk47