The word Supposer is misspelled against Supposeer, a noun meaning "One who supposes."
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Supposeer has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Suppos & r which should not be misspelled with single 'E'
Wrong Spelling:  Suppos-e-r 
Correct Spelling:  Suppos-ee-r 
Check more misspelled words of Supposeer to spell it correct.