The word Obsesion is misspelled against Obsession, a noun meaning "The act of besieging."
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Obsession has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings obse & ion which should not be misspelled with single 'S'
Wrong Spelling:  obse-s-ion 
Correct Spelling:  obse-ss-ion 
Find more incorrect spellings of Obsession to spell right way.