sulfanilic acid vs sulphanilic acid

sulfanilic acid and sulphanilic acid both are nouns.

Word	Noun	Adjective	Verb	Adverb
sulfanilic acid	Yes	No	No	No
sulphanilic acid	Yes	No	No	No

As nouns, sulfanilic acid and sulphanilic acid are synonyms defined as:

sulfanilic acid and sulphanilic acid: a crystalline acid made from aniline and used as a dye

sulfanilic acid (noun)	sulphanilic acid (noun)
a crystalline acid made from aniline and used as a dye	a crystalline acid made from aniline and used as a dye