The spelling of the word "OPPTEETD" can be challenging to decipher without proper guidance. According to the International Phonetic Alphabet (IPA), the word is pronounced as /ɒpti:tɪd/. The first syllable "opt" is pronounced as /ɒpt/ and is followed by the vowel sound "ee" /i:/ in the second syllable. The last three letters "etd" are pronounced as /ɪtd/. Therefore, the correct spelling of the word is "opted," and "OPPTEETD" might be an erroneous version generated by a spelling error or typo.