The word AIRHEUM, which is not commonly used, can be spelled according to the International Phonetic Alphabet (IPA) transcription as /ɛər-hjuːm/. The first syllable is pronounced with the sound /ɛər/, representing the vowel sound in words like "air" and "bear". The second syllable is pronounced with the sound /hjuːm/, which is a combination of the consonant sound /h/ and the vowel sound /juːm/, representing the diphthong sound in words like "human" and "music". Hence, the spelling of AIRHEUM represents the sounds heard in its pronunciation.