Hg vs quicksilver

Hg and quicksilver both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hg	Yes	No	No	No
quicksilver	Yes	Yes	No	No

As nouns, Hg and quicksilver are synonyms defined as:

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

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

Hg (noun)	quicksilver (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

Hg (adjective)	quicksilver (adjective)
	liable to sudden unpredictable change