amphetamine sulfate vs amphetamine sulphate

amphetamine sulfate and amphetamine sulphate both are nouns.

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

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

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

amphetamine sulfate (noun)	amphetamine sulphate (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