Dumvirate or Duumvirate: How To spell?
The word Dumvirate is misspelled against Duumvirate, a noun meaning "The union of two men in the same office; or the office, dignity, or government of two men thus associated, as in ancient Rome."
Duumvirate has double "uu" is mispronounced as "u"Remember double 'UU' in between the strings d & mvirate which should not be misspelled with single 'U'
Wrong Spelling:  d-u-mvirate  Correct Spelling:  d-uu-mvirate 
Check more misspelled words of Duumvirate to spell it correct.