tiered seat vs seating

tiered seat and seating both are nouns.

Word	Noun	Adjective	Verb	Adverb
tiered seat	Yes	No	No	No
seating	Yes	No	No	No

As nouns, seating is a hypernym of tiered seat; that is, seating is a word with a broader meaning than tiered seat:

tiered seat: seating that is arranged in sloping tiers so that spectators in the back can see over the heads of those in front
seating: an area that includes places where several people can sit

Other hypernyms of tiered seat include seating area, seating room, seats.

tiered seat (noun)	seating (noun)
seating that is arranged in sloping tiers so that spectators in the back can see over the heads of those in front	the service of ushering people to their seats
	an area that includes places where several people can sit