The spelling of the word "REB OUTER" can be explained through the International Phonetic Alphabet (IPA). The first syllable, "REB," sounds like "rɛb" with a short e vowel sound followed by a voiced consonant b. The second syllable, "OUTER," sounds like "aʊtər" with a diphthong vowel sound of "au" followed by a weak vowel "schwa" and a voiced consonant r. Thus, the spelling of "REB OUTER" is phonetically consistent with its pronunciation.