ris·er 
/ˈraɪzɚ/ noun
plural ris·ers /ˈraɪzɚ/ noun 1 [count] : a person who gets out of bed after sleeping — used in the phrases early riser and late riser ▪ I'm an early/late riser. [=I get out of bed early/late in the morning] 2 [count] technical : the upright board between two stairs 3 risers [plural] US : a set of tall and wide steps for standing or sitting on
▪ The school choir stood on the risers for the concert.
▪ The school choir stood on the risers for the concert.
