amphetamine sulphate vs amphetamine sulfate

amphetamine sulphate and amphetamine sulfate both are nouns.

Word	Noun	Adjective	Verb	Adverb
amphetamine sulphate	Yes	No	No	No
amphetamine sulfate	Yes	No	No	No

As nouns, amphetamine sulphate and amphetamine sulfate are synonyms defined as:

amphetamine sulphate and amphetamine sulfate: a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system

amphetamine sulphate (noun)	amphetamine sulfate (noun)
a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system	a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system