The word "ANTHA" is spelled with a "th" sound in the middle. However, if we add the prefix "ANTI," meaning against or opposing, the spelling changes to "ANTIHA." In IPA phonetic transcription, this would be /æn-ti-hɑː/, with the stress on the second syllable. The "t" in "ANTI" blends with the "h" in "HA" to create the unique "th" sound. This spelling follows standard rules for adding prefixes to words and shows how small changes can affect the pronunciation and spelling of a word.