The word Sacus is misspelled against Saccus, a noun meaning "A sac."
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Saccus has double "cc" is mispronounced as "c"
Remember double 'CC' in between the strings Sa & us which should not be misspelled with single 'C'
Wrong Spelling:  Sa-c-us 
Correct Spelling:  Sa-cc-us 
Check more misspelled words of Saccus to spell it correct.