The word Voluntering is misspelled against Volunteering, which is present continuous of "Volunteer"
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Volunteering has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings Volunt & ring which should not be misspelled with single 'E'
Wrong Spelling:  Volunt-e-ring 
Correct Spelling:  Volunt-ee-ring 
Check more misspelled words of Volunteering to spell it correct.