assuredness vs sang-froid

assuredness and sang-froid both are nouns.

Word	Noun	Adjective	Verb	Adverb
assuredness	Yes	No	No	No
sang-froid	Yes	No	No	No

As nouns, assuredness and sang-froid are synonyms defined as:

Other synonyms of assuredness include aplomb, cool, poise.

assuredness (noun)	sang-froid (noun)
great coolness and composure under strain	great coolness and composure under strain