We found one dictionary that defines the word extinction-level threat:

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1. Extinction-level threat: Wikipedia, the Free Encyclopedia

▸ Words similar to extinction-level threat ▸ Usage examples for extinction-level threat ▸ Idioms related to extinction-level threat ▸ Wikipedia articles (New!) ▸ Words that often appear near extinction-level threat ▸ Rhymes of extinction-level threat ▸ Invented words related to extinction-level threat