The spelling of the word "Twanna" is pronounced as /twɑːnə/. The first syllable "Tw" is pronounced as /tw/ and combines the sounds of the letters "T" and "W". The second syllable "an" is pronounced as /æn/ and has the sound of the letter "A" with a short "e" sound following. Lastly, the final syllable "na" is pronounced as /nə/ with the sound of the letter "N" followed by a neutral vowel.