The spelling of the word "more completing" may seem a bit confusing at first glance, but it makes sense when broken down phonetically. The first syllable, "more," is pronounced as /mɔːr/, while the second syllable, "completing," is pronounced as /kəmˈpliːtɪŋ/. The "com" in "completing" is pronounced with a long "o" sound, and the "-ing" ending is pronounced as /-ɪŋ/. Therefore, the correct spelling of this word is "more completing," with no additional letters or changes needed.