Interegnums or Interregnums: How To spell?
The word Interegnums is misspelled against Interregnums, which is plural of "Interregnum"
Interregnums has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings inte & egnums which should not be misspelled with single 'R'
Wrong Spelling:  inte-r-egnums  Correct Spelling:  inte-rr-egnums 
Check more misspelled words of Interregnums to spell it correct.