The word Sumon is misspelled against Summon, a verb meaning "To call upon to surrender, as a fort."
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Summon has double "mm" is mispronounced as "m"
Remember double 'MM' in between the strings su & on which should not be misspelled with single 'M'
Wrong Spelling:  su-m-on 
Correct Spelling:  su-mm-on 
Check more misspelled words of Summon to spell it correct.