das Brennholz
firewood
Wood that is burned for heating in a stove, fireplace, or at a campfire.
Für den Winter müssen wir noch eine große Menge Brennholz hacken.
We still have to chop a large amount of firewood for the winter.

firewood
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firewood
Wood that is burned for heating in a stove, fireplace, or at a campfire.
Für den Winter müssen wir noch eine große Menge Brennholz hacken.
We still have to chop a large amount of firewood for the winter.

The word is a clear compound of the verb 'brennen' (to burn) and the noun 'das Holz' (wood). So it literally means 'wood that is there for burning'.
Im Keller lagert das Brennholz für den Kamin.
The firewood for the fireplace is stored in the basement.
'Brennholz' (firewood) is an uncountable noun, or mass noun. You cannot say 'ein Brennholz'. Instead, you use quantity expressions like 'viel Brennholz' (a lot of firewood), 'etwas Brennholz' (some firewood), or 'ein Stapel Brennholz' (a stack of firewood).
Wir brauchen noch viel Brennholz für den kalten Winter.
We still need a lot of firewood for the cold winter.
In connection with 'Brennholz' (firewood), verbs are often used that describe processing or transport. Typical phrases are 'Brennholz hacken' (to chop firewood), 'Brennholz stapeln' (to stack firewood), or 'Brennholz holen' (to fetch firewood).
Am Samstagvormittag hat er im Garten Brennholz gehackt.
On Saturday morning, he chopped firewood in the garden.
wood
'das Holz' and 'das Brennholz' both mean wood as a material. The difference lies in the purpose. 'Holz' is general: it can be used for furniture, construction work, paper, or also for heating. 'Brennholz' is more specific and means wood that you want to burn, for example in a stove, fireplace, or campfire. The words can be confused because firewood is always wood. But not all wood is firewood. When it is about heating or fire, 'Brennholz' is more precise.

Am Montag stapeln wir das Brennholz neben dem Kamin.
On Monday, we are stacking the firewood next to the fireplace.
Für das Regal hat Tom stabiles Holz im Baumarkt gekauft.
Tom bought sturdy wood for the shelf at the hardware store.