Concept:The question tests the correct spelling of English words. A misspelt word does not exist in the dictionary.Explanation:Check each option for correct spelling.Option A: Pseudonym (छद्म नाम) – correctly spelled.Option B: Epitaph (समाधि लेख) – correctly spelled.Option C: noccuous – this is misspelt. The correct word is "innocuous", meaning harmless or not offensive (हानिरहित).Option D: Circumlocution (घुमा-फिराकर बोलना) – correctly spelled.Therefore, only option C contains an error.Answer:Option C (noccuous)