magnesium oxide vs periclase

magnesium oxide and periclase both are nouns.

Word	Noun	Adjective	Verb	Adverb
magnesium oxide	Yes	No	No	No
periclase	Yes	No	No	No

As nouns, magnesium oxide and periclase are synonyms defined as:

magnesium oxide and periclase: a white solid mineral that occurs naturally as periclase; a source of magnesium

Other synonyms of magnesium oxide include magnesia.

magnesium oxide (noun)	periclase (noun)
a white solid mineral that occurs naturally as periclase; a source of magnesium	a white solid mineral that occurs naturally as periclase; a source of magnesium