How to Say "lumber" in Spanish
The Spanish word for “lumber” is “madera” — A1 level. This is a very common word in everyday Spanish.

Examples
La mesa de mi cocina es de madera maciza.
The table in my kitchen is made of solid wood.
Necesitamos más madera para hacer la fogata.
We need more wood to make the bonfire.
El suelo de la sala tiene un hermoso acabado de madera clara.
The living room floor has a beautiful light wood finish.
Gender Check
Remember that 'madera' is a feminine noun, so you must use 'la' or 'una' before it, even though many Spanish nouns ending in -a are masculine (like 'el problema').
Mixing Material and Tree
Mistake: “Usar 'la madera' para referirse a un árbol ('I saw a tall madera').”
Correction: Use 'el árbol' for the living plant and 'la madera' for the material cut from it. 'Vi un árbol alto' (I saw a tall tree).
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