gypsum vs calcium sulphate

gypsum and calcium sulphate both are nouns.

Word	Noun	Adjective	Verb	Adverb
gypsum	Yes	No	No	No
calcium sulphate	Yes	No	No	No

As nouns, calcium sulphate is a hypernym of gypsum; that is, calcium sulphate is a word with a broader meaning than gypsum:

gypsum: a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
calcium sulphate: a white salt (CaSO4)

Other hypernyms of gypsum include mineral, calcium sulfate.

gypsum (noun)	calcium sulphate (noun)
a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)	a white salt (CaSO4)