native sulphur vs native sulfur

native sulphur and native sulfur both are nouns.

Word	Noun	Adjective	Verb	Adverb
native sulphur	Yes	No	No	No
native sulfur	Yes	No	No	No

As nouns, native sulphur and native sulfur are synonyms defined as:

Other synonyms of native sulphur include brimstone.

native sulphur (noun)	native sulfur (noun)
an old name for sulfur	an old name for sulfur