pyrrhotite vs magnetic pyrites

pyrrhotite and magnetic pyrites both are nouns.

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

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

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

Other synonyms of pyrrhotite include pyrrhotine.

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