The spelling of the word "KHRU" might seem strange to those unfamiliar with Thai language. The correct pronunciation is /kruː/. The "KH" represents the /kʰ/ sound which is a voiceless velar plosive. The "R" at the end is pronounced with the rolling r sound /r/. The "U" is pronounced with a long sound /uː/. This word is commonly used in Thai to refer to a teacher or a master of a particular skill or subject. Its spelling may take some getting used to, but it's an important word in Thai culture.