The word "RIBAUSA" is quite unusual, but its spelling can be broken down using the International Phonetic Alphabet (IPA). The IPA phonetic transcription for the word is /rɪbaʊsə/, which means that it is pronounced with a short "i" sound (like in "bit"), a "b" sound, a diphthong "au" sound (as in "how"), an "s" sound, and a schwa "ə" sound (as in the sound at the end of "sofa"). So, the spelling of "RIBAUSA" corresponds to its pronunciation in the IPA.