The word Siper is misspelled against Sipper, a noun meaning "One whi sips."
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Sipper has double "pp" is mispronounced as "p"
Remember double 'PP' in between the strings si & er which should not be misspelled with single 'P'
Wrong Spelling:  si-p-er 
Correct Spelling:  si-pp-er 
Find more wrongly spelled words of Sipper to spell it well.