The word "RIUS" is spelled using the International Phonetic Alphabet (IPA) transcription as /ˈriːəs/. The first two letters "RI" sound like the word "ree" and the last letter "US" is pronounced like "uhs." The pronunciation of this word is important in accurate communication as a slight variation in the sound can result in a different word. The IPA provides a standardized way to learn the correct pronunciation of words, especially for English language learners.