Fast horse - Hayauma

Japanese: 早馬 - はやうま

〘noun〙① A horse ridden by a Hayauchi messenger. A horse for a courier. Also, a courier riding on that horse. ※Heike (early 13th century) 5 "He sent a fast horse to Fukuhara to tell them." ② A horse that runs fast. A horse that runs well. A swift horse. ※Heichu (around 965) 34 "Because this man was a stealthy man, he would live with the thought of being his wife, even though he didn't think he was his wife."

Hayama [Fast horse]

〘Noun〙① = Hayauma (fast horse) [Collected Words (around 1797)] ② God of cattle and horses. Also, the horse race (kurabeuma) held at the festival of that god. In Kagoshima Prefecture.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙① 早打(はやうち)の使者の乗る馬。急使の馬。また、その馬に乗る急使。※平家（１３Ｃ前）五「福原へ早馬をもって申けるは」② はやく走る馬。よく走る馬。駿馬。※平中（965頃）三四「この男、忍びたるものから、はやむまと思はぬ人の、まと思ひに思ひて住むぞ、ありける」