coldness vs low temperature

coldness and low temperature both are nouns.

Word	Noun	Adjective	Verb	Adverb
coldness	Yes	No	No	No
low temperature	Yes	No	No	No

As nouns, coldness and low temperature are synonyms defined as:

Other synonyms of coldness include cold, frigidity, frigidness.

coldness (noun)	low temperature (noun)
the absence of heat	the absence of heat
a lack of affection or enthusiasm
the sensation produced by low temperatures