The spelling of the word "Rethman" can be explained using the International Phonetic Alphabet (IPA). The first syllable is pronounced as /rɛθ/, where the "r" sound is followed by the "e" sound as in "bed." The "th" sound is then added to complete the syllable. The second syllable, "man," is pronounced as /man/ with the "a" sound as in "cat" followed by the "n" sound. Together, the word is pronounced as /rɛθmæn/.