atomic number 80 vs mercury

atomic number 80 and mercury both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 80	Yes	No	No	No
mercury	Yes	No	No	No

As nouns, atomic number 80 and mercury are synonyms defined as:

atomic number 80 and mercury: a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures

Other synonyms of atomic number 80 include Hg, hydrargyrum, quicksilver.

atomic number 80 (noun)	mercury (noun)
a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures	temperature measured by a mercury thermometer
	a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures