The spelling of the word "dharker" can be explained through the use of the International Phonetic Alphabet (IPA). The "dh" corresponds to the voiced dental fricative sound, which is produced by placing the tongue between the teeth and creating a vibrating sound. The "a" is pronounced with an open central vowel sound. The "r" is rolled or trilled, depending on the speaker's accent. Overall, the spelling of "dharker" accurately represents the unique sounds in the word.