The spelling of the word "Zantha" can be explained using IPA phonetic transcription as /zænθə/. The "z" is pronounced as the voiced alveolar fricative /z/, while "an" is pronounced as the short "a" sound /æ/ followed by the nasal consonant /n/. The "th" in "tha" is pronounced as the dental fricative /θ/ and the final "a" is pronounced as the schwa sound /ə/. Overall, the spelling and pronunciation of "Zantha" follow the conventions of English phonetics.