
der Kahn
punt
A small, flat boat without a keel, often moved by punting (pushing with a long pole).
Im Spreewald haben wir eine romantische Fahrt mit einem Kahn gemacht.
In the Spreewald, we took a romantic ride in a punt.
punt / old tub
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punt
A small, flat boat without a keel, often moved by punting (pushing with a long pole).
Im Spreewald haben wir eine romantische Fahrt mit einem Kahn gemacht.
In the Spreewald, we took a romantic ride in a punt.

old tub
Colloquial and often derogatory for an old, large, and sluggish ship, or also an old, rickety car.
Dieser rostige Kahn von einem Auto wird den nächsten Winter kaum überstehen.
This rusty old tub of a car will hardly make it through next winter.
In the meaning of an old vehicle, 'Kahn' (old tub) is colloquial and slightly derogatory. It describes a vehicle that someone considers old, slow, or unreliable.
Mit diesem alten Kahn von Auto will ich nicht in den Urlaub fahren.
I don't want to go on vacation in this old tub of a car.
The meaning is easy to recognize from context. If people are talking about water, rivers, or a boat trip, it means the boat. In connection with negative adjectives like 'alt' (old) or 'rostig' (rusty) for a vehicle, the colloquial meaning is meant.
Auf dem Fluss trieb ein kleiner Kahn.
A small punt was drifting on the river.
Common activities are 'eine Kahnfahrt machen' (to take a punt ride) or 'mit dem Kahn fahren' (to travel/go by punt). A very typical verb is 'staken' (to punt), which means to push the punt forward with a long pole.
Im Spreewald kann man sich in einem Kahn durch die Kanäle staken lassen.
In the Spreewald, you can have someone punt you through the canals in a punt.
ship
Schiff is the neutral term for a large watercraft. Kahn can colloquially refer to the same vessel when it looks old, sluggish, or poorly maintained; the word often sounds derogatory. Schiff is therefore more suitable for a factual statement.

Dieser alte Kahn fährt tatsächlich noch jeden Morgen zur Insel.
This old tub actually still sails to the island every morning.
Das alte Schiff fährt noch jeden Morgen zur Insel.
The old ship still sails to the island every morning.