plagioclase vs feldspar

plagioclase and feldspar both are nouns.

Word	Noun	Adjective	Verb	Adverb
plagioclase	Yes	No	No	No
feldspar	Yes	No	No	No

As nouns, feldspar is a hypernym of plagioclase; that is, feldspar is a word with a broader meaning than plagioclase:

plagioclase: any of a series of triclinic feldspars that form rocks
feldspar: any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium

Other hypernyms of plagioclase include felspar.

plagioclase (noun)	feldspar (noun)
any of a series of triclinic feldspars that form rocks	any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium