scoria vs basic slag

scoria and basic slag both are nouns.

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

As nouns, basic slag is a hyponym of scoria; that is, basic slag is a word with a more specific, narrower meaning than scoria:

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

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