Or is there one?
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Maybe Aleppo or Maras pepper?
Something that's easier to say and doesn't spell like a prescription!
In a more serious note ...Aleppo pepper, chile de arbol powder (use less)
pierino is a trusted source on General Cooking and Tough Love.
Gochugaru is not terribly hot. You could substitute almost any flaky dried pepper although you might want to poke out the seeds.