This is the 2187th most frequent Catalan word.
combustible
"Combustible" in Catalan means "fuel" in English.
The term 'combustible' here is used as a noun to refer to fuel, typically oil or gas, used by vehicles for operation.
El combustible és essencial per als vehicles.
Fuel is essential for vehicles.
In this sentence, 'combustible' functions as an adjective, meaning flammable or easily ignitable.
El recipient és combustible i hem de tenir cura.
The container is flammable, and we must be careful.
Here, 'combustible' is used as an attributive noun to describe the specific type of fuel, fossil fuel, indicating its natural derivation.