nervelessness vs coolness

nervelessness and coolness both are nouns.

Word	Noun	Adjective	Verb	Adverb
nervelessness	Yes	No	No	No
coolness	Yes	No	No	No

As nouns, nervelessness and coolness are synonyms defined as:

nervelessness and coolness: fearless self-possession in the face of danger

nervelessness (noun)	coolness (noun)
fearless self-possession in the face of danger	the property of being moderately cold
	a lack of affection or enthusiasm
	fearless self-possession in the face of danger
	calm and unruffled self-assurance