schorl vs tourmaline

schorl and tourmaline both are nouns.

Word	Noun	Adjective	Verb	Adverb
schorl	Yes	No	No	No
tourmaline	Yes	No	No	No

As nouns, tourmaline is a hypernym of schorl; that is, tourmaline is a word with a broader meaning than schorl:

schorl: black tourmaline
tourmaline: a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones

schorl (noun)	tourmaline (noun)
black tourmaline	a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones