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For many non-native speakers, the “xth” three-consonant cluster in words like “sixth” are quite the tongue twister. A Reddit thread asked users to weigh in on which words in the English language were hard words to pronounce and “sixth” made the list. One user commented, “What kind of word has an ‘s’ and ‘xth’ sound?” Not sure anyone has the answer for that yet and we may never know. Next, find out the 20 words even smart people mispronounce.