orthoclase vs feldspar

orthoclase and feldspar both are nouns.

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

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

orthoclase: a white or colored monoclinic feldspar
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 orthoclase include felspar.

orthoclase (noun)	feldspar (noun)
a white or colored monoclinic feldspar	any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium