slag vs basic slag

slag and basic slag both are nouns.

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

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

slag: 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

slag (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

slag (verb)	basic slag (verb)
convert into slag