Interex or Interrex: How To spell?

The word Interex is misspelled against Interrex, a noun meaning "An interregent, or a regent."

Interrex has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings inte & ex which should not be misspelled with single 'R'
Wrong Spelling:  inte-r-ex 
Correct Spelling:  inte-rr-ex 
Explore spell check of Interrex to spell without errors.

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