The difference between Dross and Slag

When used as nouns, dross means waste or impure matter, whereas slag means waste material from a coal mine.

When used as verbs, dross means to remove dross from, whereas slag means to produce slag.

check bellow for the other definitions of Dross and Slag

Dross as a noun:

Waste or impure matter.
Dross as a noun:

Residue that forms on the surface of a metal from oxidation.
Dross as a noun:

The impurities in metal.
Dross as a noun:

A waste product from working with metal.
Dross as a noun (figurative):

Worthless or trivial matter.

Examples:

"synonyms: junk rubbish"

Slag as a noun:

Waste material from a coal mine.
Slag as a noun:

Scum that forms on the surface of molten metal.
Slag as a noun:

Impurities formed and separated out when a metal is smelted from ore; vitrified cinders.
Slag as a noun:

Hard aggregate remaining as a residue from blast furnaces, sometimes used as a surfacing material.
Slag as a noun:

Scoria associated with a volcano.
Slag as a noun (UK, pejorative, dated):

A coward.
Slag as a noun (UK, chiefly, Cockney, pejorative):

A contemptible person, a scumbag.
Slag as a noun (UK, pejorative):

A prostitute.
Slag as a noun (UK, Australia, New Zealand, South Africa, slang, pejorative):

A woman (sometimes a man) who has loose morals relating to sex; a slut.

Slag as a verb (transitive):

To produce slag.
Slag as a verb (intransitive):

To become slag; to agglomerate when heated below the fusion point.
Slag as a verb (transitive, sometimes with "off"):

To talk badly about; to malign or denigrate (someone).
Slag as a verb (intransitive, Australia, slang):

To spit.