barium sulphate vs heavy spar

barium sulphate and heavy spar both are nouns.

Word	Noun	Adjective	Verb	Adverb
barium sulphate	Yes	No	No	No
heavy spar	Yes	No	No	No

As nouns, barium sulphate and heavy spar are synonyms defined as:

barium sulphate and heavy spar: a white or colorless mineral (BaSO4); the main source of barium

Other synonyms of barium sulphate include barite, barytes.

barium sulphate (noun)	heavy spar (noun)
a white insoluble radiopaque powder used as a pigment	a white or colorless mineral (BaSO4); the main source of barium
a white or colorless mineral (BaSO4); the main source of barium