The spelling of the word "harker" is fairly straightforward if we break it down using the International Phonetic Alphabet (IPA). The first syllable is pronounced /hɑːr/, which corresponds to the English letter "h" followed by the vowel sound "ah". The second syllable is pronounced /kər/, which corresponds to the English letter "k" followed by the vowel sound "uh" and the English letter "r". Therefore, "harker" is spelled as it is pronounced using the IPA.