Subingresion or Subingression: How To spell?
The word Subingresion is misspelled against Subingression, a noun meaning "Secret entrance."
Subingression has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings subingre & ion which should not be misspelled with single 'S'
Wrong Spelling:  subingre-s-ion  Correct Spelling:  subingre-ss-ion 
Check more misspelled words of Subingression to spell it correct.