How Do You Spell SSTER?
Pronunciation: [ˈɛsstˈɜː] (IPA) 
The spelling of the word "SSTER" seems unusual, but it can actually be easily explained using IPA phonetic transcription. When pronounced, the word sounds like "sister" with the "i" sound omitted. In IPA, the word would be transcribed as /ˈsɪstər/, with the first "s" representing the voiceless "s" sound, the "i" replaced with the unstressed schwa sound /ə/, and the final "er" pronounced with a neutral "uh" vowel sound /ər/. Therefore, "SSTER" is simply an alternative, phonetically-based spelling of "sister."
