The word "kamsui" is a dialectal variation of "kamsaengi," meaning "thankful" in Korean. Its spelling is derived from the International Phonetic Alphabet (IPA) transcription of the Korean word, which is /kam.seŋ.i/. The "s" sound is represented by the letter "s," the "ng" sound is represented by the letter "ng," and the vowels are represented by the letters "a" and "i." It is important to understand IPA phonetic transcription when learning new words or languages.