The word Retaunable is misspelled against Retainable, an adjective meaning "Capable of being retained."
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Word contains consecutive vowels 'AI' in between alphabets ret & nable is misspelled as 'AU'
Wrong Spelling:  ret-au-nable 
Correct Spelling:  ret-ai-nable 
Check more misspelled words of Retainable to spell it correct.