magnetic pyrites vs pyrrhotine

magnetic pyrites and pyrrhotine both are nouns.

Word	Noun	Adjective	Verb	Adverb
magnetic pyrites	Yes	No	No	No
pyrrhotine	Yes	No	No	No

As nouns, magnetic pyrites and pyrrhotine are synonyms defined as:

magnetic pyrites and pyrrhotine: a brownish iron sulfide mineral (FeS) having weak magnetic properties

Other synonyms of magnetic pyrites include pyrrhotite.

magnetic pyrites (noun)	pyrrhotine (noun)
a brownish iron sulfide mineral (FeS) having weak magnetic properties	a brownish iron sulfide mineral (FeS) having weak magnetic properties