The spelling of the word "rd cap" is quite simple if we break it down phonetically. The IPA transcription of this word is ɑːrd kæp. The first syllable, "ard," uses the long "a" sound and the "r" sound. The second syllable, "cap," uses the short "a" sound and the "p" sound. When pronounced together, the word sounds like "ard cap." This spelling and pronunciation are crucial to ensure clear communication and understanding among individuals.