quicksilver vs atomic number 80

quicksilver and atomic number 80 both are nouns.

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

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

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

Other synonyms of quicksilver include Hg, hydrargyrum, mercury.

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

quicksilver (adjective)	atomic number 80 (adjective)
liable to sudden unpredictable change