nephelite vs nepheline

nephelite and nepheline both are nouns.

Word	Noun	Adjective	Verb	Adverb
nephelite	Yes	No	No	No
nepheline	Yes	No	No	No

As nouns, nephelite and nepheline are synonyms defined as:

nephelite and nepheline: a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels

nephelite (noun)	nepheline (noun)
a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels	a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels