ober
upper
Describes a position that is farther up or in the upper part of something.
Die Gläser stehen im oberen Fach des Schranks.
The glasses are in the upper compartment of the cabinet.

upper
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upper
Describes a position that is farther up or in the upper part of something.
Die Gläser stehen im oberen Fach des Schranks.
The glasses are in the upper compartment of the cabinet.

The adjective 'ober' (upper) is used almost exclusively before a noun (attributively) and must be declined. You cannot say: 'Das Regal ist ober.'
Bitte nimm das Buch aus dem oberen Regal.
Please take the book from the upper shelf.
Although 'ober' (upper) expresses a comparative idea (farther up than something else), it itself cannot be compared. Forms like 'oberer' or 'am obersten' do not exist.
Die Wohnung befindet sich in der oberen Etage des Hauses.
The apartment is on the upper floor of the house.
In its spatial meaning, 'ober' (upper) is often combined with parts of buildings or objects. Typical phrases are 'der obere Stock' (the upper floor), 'das obere Ende' (the upper end), or 'der obere Bereich' (the upper area).
Im oberen Teil des Gartens wachsen Rosen.
Roses grow in the upper part of the garden.
When 'ober' (upper) describes a higher position in a hierarchy, you find it in combinations such as 'die oberen Ränge' (the upper ranks), 'die obere Managementebene' (upper management level), or 'die oberen Zehntausend' (the richest social class).
Diese Anweisung kam direkt von der oberen Geschäftsleitung.
This instruction came directly from upper management.
over / about
'über' and 'ober' both have to do with a higher position. But 'über' is a preposition and describes where something is or where something is moving: something hangs 'über dem Tisch' (above the table). 'ober' is an adjective and describes a part of something that is higher up, for example 'die obere Etage' (the upper floor). It is easy to confuse the words because both bring 'oben' (up / above) to mind. The important difference is the grammar: 'über' usually needs a reference word with case, while 'ober' stands like an adjective before a noun and is declined.

Die oberen Regale sind für kleine Kinder schwer zu erreichen.
The upper shelves are hard for small children to reach.
Über dem Eingang hängt ein großes Schild.
A large sign hangs above the entrance.