The word Antithaism is misspelled against Antitheism, a noun meaning "The doctrine of antitheists."
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Word contains consecutive vowels 'EI' in between alphabets antith & sm is misspelled as 'AI'
Wrong Spelling:  antith-ai-sm 
Correct Spelling:  antith-ei-sm 
Find more wrongly spelled words of Antitheism to spell it well.