bitter spar vs dolomite

bitter spar and dolomite both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitter spar	Yes	No	No	No
dolomite	Yes	No	No	No

As nouns, bitter spar and dolomite are synonyms defined as:

bitter spar and dolomite: a light colored mineral consisting of calcium magnesium carbonate; a source of magnesium; used as a ceramic and as fertilizer

bitter spar (noun)	dolomite (noun)
a light colored mineral consisting of calcium magnesium carbonate; a source of magnesium; used as a ceramic and as fertilizer	a kind of sedimentary rock resembling marble or limestone but rich in magnesium carbonate
	a light colored mineral consisting of calcium magnesium carbonate; a source of magnesium; used as a ceramic and as fertilizer