mercury vs temperature

mercury and temperature both are nouns.

Word	Noun	Adjective	Verb	Adverb
mercury	Yes	No	No	No
temperature	Yes	No	No	No

As nouns, temperature is a hypernym of mercury; that is, temperature is a word with a broader meaning than mercury:

mercury: temperature measured by a mercury thermometer
temperature: the degree of hotness or coldness of a body or environment (corresponding to its molecular activity)

mercury (noun)	temperature (noun)
temperature measured by a mercury thermometer	the degree of hotness or coldness of a body or environment (corresponding to its molecular activity)
a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures	the somatic sensation of cold or heat