A large hotel can list a dozen room categories with names that mean little from outside. The proliferation is a pricing structure imposed on a building that was never uniform.
Old buildings produce genuinely different rooms
Historic hotels were rarely built as hotels, or were built before standardised layouts existed. Floor plans differ by wing, by floor and sometimes by room.
Ceiling heights, window sizes, corner positions and outlook all vary, and none of that can be normalised without gutting the building.
Rather than average the price across rooms of unequal quality, the hotel names the differences and charges for them, which is how a category list grows.
Categories let a hotel sell the same room twice
A room's grade is partly physical and partly a description of what comes with it: a higher floor, a view, lounge access, or a larger allowance at breakfast.
Two rooms of identical dimensions can therefore sit in different categories, with the gap between them defined by inclusions rather than by square metres.
This is why upgrades are cheaper to grant than they appear. Moving a guest into an empty higher category costs the hotel the inclusions, not the room.
The ladder supports revenue management
A long ladder of categories gives the hotel many price points and allows it to sell out the cheapest grades first while keeping expensive inventory available.
It also creates upsell opportunities at check-in, when the guest is present and the hotel knows exactly what remains unsold for that night.
The offer made at the desk is usually priced below the online gap, because at that hour the alternative is an empty room earning nothing.
Suite definitions are not standardised
No universal rule says what makes a suite. Some properties require a separate room with a door; others apply the label to a larger open-plan room.
Junior, executive, deluxe and similar qualifiers are marketing terms whose meaning is set by each hotel independently.
The reliable test is the floor plan and the stated size rather than the name, and reputable hotels publish both for exactly this reason.
Knowing the ladder helps at booking
Where categories differ mainly by view, the gap is worth paying only if time will be spent in the room during daylight.
Where they differ by lounge access, the value depends on whether breakfast and evening service would otherwise be bought separately.
Asking which specific rooms sit in a category, and requesting one by number, is normal practice and is treated as a reasonable request rather than an unusual one.