Interegnum or Interregnum: How To spell?
The word Interegnum is misspelled against Interregnum, a noun meaning "Any period during which, for any cause, the executive branch of a government is suspended or interrupted."
Interregnum has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings inte & egnum which should not be misspelled with single 'R'
Wrong Spelling:  inte-r-egnum  Correct Spelling:  inte-rr-egnum 
Check more misspelled words of Interregnum to spell it correct.