sang-froid vs calm

sang-froid and calm both are nouns.

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

As nouns, calm is a hypernym of sang-froid; that is, calm is a word with a broader meaning than sang-froid:

Other hypernyms of sang-froid include calmness, composure, equanimity.

sang-froid (noun)	calm (noun)
great coolness and composure under strain	steadiness of mind under stress
	wind moving at less than 1 knot; 0 on the Beaufort scale

sang-froid (adjective)	calm (adjective)
	(of weather) free from storm or wind
	not agitated; without losing self-possession

sang-froid (verb)	calm (verb)
	cause to be calm or quiet as by administering a sedative to
	make steady
	make calm or still
	become quiet or calm, especially after a state of agitation