brimstone vs native sulphur

brimstone and native sulphur both are nouns.

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

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

Other synonyms of brimstone include native sulfur.

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