basic slag vs scoria

basic slag and scoria both are nouns.

Word	Noun	Adjective	Verb	Adverb
basic slag	Yes	No	No	No
scoria	Yes	No	No	No

As nouns, scoria is a hypernym of basic slag; that is, scoria is a word with a broader meaning than basic slag:

basic slag: slag produced in making steel; low in silica but having large amounts of calcium phosphate; useful as fertilizer
scoria: the scum formed by oxidation at the surface of molten metals

Other hypernyms of basic slag include dross, slag.

basic slag (noun)	scoria (noun)
slag produced in making steel; low in silica but having large amounts of calcium phosphate; useful as fertilizer	the scum formed by oxidation at the surface of molten metals