feldspar vs felspar

feldspar and felspar both are nouns.

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

As nouns, feldspar and felspar are synonyms defined as:

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

feldspar (noun)	felspar (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