--> Exterraneous has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings exte & aneous which should not be misspelled with single 'R'
Wrong Spelling:  exte-r-aneous 
Correct Spelling:  exte-rr-aneous 
Check more misspelled words of Exterraneous to spell it correct.