Several reputable organizations provide comprehensive C2 word lists for learners preparing for exams like the Cambridge C2 Proficiency (CPE) or IELTS :
At this advanced level, simple memorization is rarely enough. Experts from Keith Speaking Academy and the British Council recommend the following strategies: C2 Proficient Level - International English Test C2 Level English Vocabulary List Pdf
Some recommended PDF resources for C2 level English vocabulary include: C2 Level English Vocabulary List Pdf