oligoclase vs feldspar

oligoclase and feldspar both are nouns.

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

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

oligoclase: 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 oligoclase include felspar.

oligoclase (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