aplomb vs sang-froid

aplomb and sang-froid both are nouns.

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

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

Other synonyms of aplomb include assuredness, cool, poise.

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