senior high school senior high school /ˈsiːniər haɪ skuːl/

noun

1. () [ N. American] A public secondary school usually including grades 9 through 12  ( high [Informal, N. American] , highschool , senior high [ N. American] , high school , senior high school [ N. American] )
   a public secondary school usually including grades 9 through 12
    He goes to the neighborhood highschool
   he goes to the neighborhood highschool