The spelling of the word "sweetser" can be a little tricky, but can be explained with the International Phonetic Alphabet (IPA). The first syllable is pronounced as "swi:t," with the "s" and "w" sounds pronounced separately, followed by a long "e" sound (represented by the colon). The second syllable is pronounced as "suh," with a short "e" vowel and a soft "s" sound. Therefore, the correct spelling of this word is "sweetser."