tiered seat

nouns

seating that is arranged in sloping tiers so that spectators in the back can see over the heads of those in front
tiered seat
is a part of
a sloping gallery with seats for spectators (as in an operating room or theater)
amphitheater, amphitheatre
is a part of
a large structure for open-air sports or entertainments
arena, bowl, sports stadium, stadium
is a part of
a building where theatrical performances or motion-picture shows can be presented
"the house was full"
house, theater, theatre
is a type of (narrower)
an area that includes places where several people can sit
"there is seating for 40 students in this classroom"
seating, seating area, seating room, seats