chilliness vs coldness

chilliness and coldness both are nouns.

Word	Noun	Adjective	Verb	Adverb
chilliness	Yes	No	No	No
coldness	Yes	No	No	No

As nouns, coldness is a hypernym of chilliness; that is, coldness is a word with a broader meaning than chilliness:

Other hypernyms of chilliness include cold, frigidity, frigidness, low temperature.

As nouns, chilliness and coldness are synonyms defined as:

Other synonyms of chilliness include coolness, frigidity, frigidness, iciness.

chilliness (noun)	coldness (noun)
the property of being moderately cold	the absence of heat
a lack of affection or enthusiasm	a lack of affection or enthusiasm
	the sensation produced by low temperatures