pyrrhotine vs magnetic pyrites

pyrrhotine and magnetic pyrites both are nouns.

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

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

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

Other synonyms of pyrrhotine include pyrrhotite.

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