The spelling of the word "twostar" follows the English language phonetic rules. In IPA phonetic transcription, it would be written as /tuːstɑːr/. The "t" represents the voiceless alveolar stop, the "u" represents the long "oo" sound, the "s" represents the voiceless alveolar fricative, the "t" represents the voiceless alveolar stop again, the "ɑː" represents the long "a" sound, and finally the "r" represents the voiced alveolar approximant. Overall, the spelling accurately depicts the pronunciation of the word "twostar."