The word Slidery is misspelled against Sliddery, a verb meaning "Slippery."
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Sliddery has double "dd" is mispronounced as "d"
Remember double 'DD' in between the strings Sli & ery which should not be misspelled with single 'D'
Wrong Spelling:  Sli-d-ery 
Correct Spelling:  Sli-dd-ery 
Find more wrongly spelled words of Sliddery to spell it well.