sodium thiosulphate vs sodium thiosulfate

sodium thiosulphate and sodium thiosulfate both are nouns.

Word	Noun	Adjective	Verb	Adverb
sodium thiosulphate	Yes	No	No	No
sodium thiosulfate	Yes	No	No	No

As nouns, sodium thiosulphate and sodium thiosulfate are synonyms defined as:

sodium thiosulphate and sodium thiosulfate: a compound used as a fixing agent in photographic developing

Other synonyms of sodium thiosulphate include hypo.

sodium thiosulphate (noun)	sodium thiosulfate (noun)
a compound used as a fixing agent in photographic developing	a compound used as a fixing agent in photographic developing