der Baumstamm
tree trunk
The thick, woody main part of a tree, located between the roots and the crown with its branches.
Der Specht hämmerte ein Loch in den alten Baumstamm.
The woodpecker hammered a hole into the old tree trunk.

tree trunk
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tree trunk
The thick, woody main part of a tree, located between the roots and the crown with its branches.
Der Specht hämmerte ein Loch in den alten Baumstamm.
The woodpecker hammered a hole into the old tree trunk.

The word is made up of 'Baum' (tree) and 'Stamm' (trunk). So it literally describes the trunk of a tree.
Die Kinder kletterten auf den dicken Baumstamm.
The children climbed onto the thick tree trunk.
Common actions connected with a tree trunk are 'einen Baumstamm fällen' (to fell a tree trunk), 'zersägen' (to saw up), or 'sich an einen Baumstamm lehnen' (to lean against a tree trunk).
Der Forstarbeiter muss den alten Baumstamm zersägen.
The forestry worker has to saw up the old tree trunk.
A tree trunk is often described with adjectives such as 'dick' (thick), 'dünn' (thin), 'alt' (old), 'morsch' (rotten), or 'glatt' (smooth).
Vorsicht, der morsche Baumstamm könnte zusammenbrechen.
Careful, the rotten tree trunk could collapse.
trunk / tribe
'der Stamm' and 'der Baumstamm' can mean the same thing: the thick, woody main part of a tree. 'Baumstamm' is completely unambiguous because it refers only to the tree. 'Stamm' is shorter and very natural in this context, but it also has other meanings, for example with groups of people or in language. If the context makes it clear that you are talking about a tree, you can use both words. If you want to avoid misunderstandings, 'Baumstamm' is more precise.

Die Kinder balancieren vorsichtig über den Baumstamm am Bach.
The children carefully balance across the tree trunk by the stream.
Der Stamm der alten Eiche ist sehr breit.
The trunk of the old oak tree is very wide.