anomaly[noun]Synonyms: irregularity, abnormality, eccentricity, exception, incongruity, inconsistency, oddity, peculiarity 
 [TahlilGaran] English Synonym Dictionary ▲
 a‧nom‧a‧ly /əˈnɒməli $ əˈnɑː-/ 
 noun (
plural anomalies)
 [uncountable and countable] formal something that is noticeable because it is different from what is usual: 
 In those days, a woman professor was still an anomaly.anomaly in
 In those days, a woman professor was still an anomaly.anomaly in various anomalies in the tax system
 various anomalies in the tax system  [TahlilGaran] Dictionary of Contemporary English ▲