ashfall

As nouns the difference between ash and ashfall

is that ash is the solid remains of a fire while ashfall is the precipitation of ash from a volcanic eruption.

As a verb ash

is to reduce to a residue of ash. See ashing.

As a proper noun Ash

is {{surname|topographic|from=Middle English}} for someone who lived near ash trees.

As nouns the difference between taxonomy and ashfall

is that taxonomy is the science or the technique used to make a classification while ashfall is the precipitation of ash from a volcanic eruption.