oligoclase vs plagioclase

oligoclase and plagioclase both are nouns.

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

As nouns, oligoclase and plagioclase are synonyms defined as:

oligoclase and plagioclase: any of a series of triclinic feldspars that form rocks

oligoclase (noun)	plagioclase (noun)
any of a series of triclinic feldspars that form rocks	any of a series of triclinic feldspars that form rocks