The spelling of the word "horse horse" is quite straightforward when broken down phonetically. The first syllable is spelled with the open-mid back unrounded vowel /ɔ/, represented by the letter "o." The second syllable is pronounced with the same vowel sound, but is spelled with the letter "a" due to the influence of the following "r" sound. The final syllable is spelled with the voiceless alveolar fricative /s/, represented by the letter "s." Therefore, the correct spelling of this word is "hor-suhrs," with emphasis on the first syllable.