How to Say "ash" in Spanish
The Spanish word for “ash” is “cenizas” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
as a collective substance

Examples
Después del incendio, solo quedaron cenizas.
After the fire, only ashes remained.
Hay que limpiar las cenizas de la chimenea.
We need to clean the ashes out of the fireplace.
La erupción cubrió el pueblo con cenizas volcánicas.
The eruption covered the town with volcanic ash.
Always Plural
In Spanish, 'cenizas' is almost always used in the plural form, even if you are referring to a single mass of ash.
Using the Singular
Mistake: “Poner la ceniza en el cubo.”
Correction: Poner las cenizas en el cubo. (The plural form is standard for the substance.)
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