felspar vs feldspar

felspar and feldspar both are nouns.

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

As nouns, felspar and feldspar are synonyms defined as:

felspar and feldspar: any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium

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