The word Reteinable 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 'EI'
Wrong Spelling:  ret-ei-nable 
Correct Spelling:  ret-ai-nable 
Find more wrongly spelled words of Retainable to spell it well.