
die Büchse
can
A cylindrical metal container in which food is preserved; a tin can.
Für den Salat brauchen wir noch eine Büchse Mais.
For the salad, we still need a can of corn.
can / rifle
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can
A cylindrical metal container in which food is preserved; a tin can.
Für den Salat brauchen wir noch eine Büchse Mais.
For the salad, we still need a can of corn.

rifle
A gun with a rifled barrel, used for precise shots over long distances.
Der Jäger zielte mit seiner Büchse auf den Hirsch.
The hunter aimed his rifle at the stag.

collection box
A smaller container, often with a slot, used for collecting money, e.g. a piggy bank or collection box.
Am Ausgang stand eine Büchse für Spenden an das Tierheim.
At the exit there was a collection box for donations to the animal shelter.

Pandora's box
A fixed expression for a source of great and unexpected trouble. It refers to Greek mythology.
Die Veröffentlichung der geheimen Dokumente öffnete die Büchse der Pandora.
The publication of the secret documents opened Pandora's box.
You can almost always recognize the meaning of 'Büchse' (can, rifle, collection box) from the context. If it is about food, it means a tin can. If it is about hunting or shooting, it means a rifle. If it is about money, it means a piggy bank or collection box.
Ich öffne eine Büchse Bohnen für das Chili.
I'm opening a can of beans for the chili.
For a tin can, the word 'die Dose' (the can) is used more often in large parts of Germany and in Austria. 'Die Büchse' (the can) can sound somewhat regional or old-fashioned in this context.
Er hat immer ein paar Büchsen mit Suppe im Vorratsschrank.
He always has a few cans of soup in the pantry.
In the meaning 'container for money', 'Büchse' (collection box) is often part of compound words. The most common are 'die Spendenbüchse' (donation box) and 'die Sammelbüchse' (collection box).
Für die Klassenfahrt wurde eine Sammelbüchse aufgestellt.
A collection box was set up for the class trip.
The idiom 'die Büchse der Pandora öffnen' (to open Pandora's box) is a fixed expression from Greek mythology. It is always used in this form and means to trigger an action that leads to unforeseeable and serious trouble.
Mit seiner unbedachten Frage öffnete der Journalist die Büchse der Pandora.
With his thoughtless question, the journalist opened Pandora's box.
can / container / socket
For preserved foods, Dose and Büchse refer to the same cylindrical metal container. Dose is the standard term used across regions today; depending on the region, Büchse sounds more traditional or old-fashioned. In neutral Standard German, Dose is therefore usually the better choice.

Ihr Großvater verwendet für denselben Behälter das regionale Wort Büchse.
Her grandfather uses the regional word “Büchse” for the same container.
Im Supermarkt bittet Lea auf Hochdeutsch um eine Dose mit Erbsen.
At the supermarket, Lea asks for a can of peas in Standard German.