The word Mouseline is misspelled against Mousseline, a noun meaning "Muslin."
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Mousseline has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings mou & eline which should not be misspelled with single 'S'
Wrong Spelling:  mou-s-eline 
Correct Spelling:  mou-ss-eline 
Check more misspelled words of Mousseline to spell it correct.