carte blanche vs potency

carte blanche and potency both are nouns.

Word	Noun	Adjective	Verb	Adverb
carte blanche	Yes	No	No	No
potency	Yes	No	No	No

As nouns, potency is a hypernym of carte blanche; that is, potency is a word with a broader meaning than carte blanche:

Other hypernyms of carte blanche include authorisation, authority, authorization, dominance, say-so.

carte blanche (noun)	potency (noun)
complete freedom or authority to act	capacity to produce strong physiological or chemical effects
	the power or right to give orders or make decisions
	the state of being potent; a male's capacity to have sexual intercourse
	the inherent capacity for coming into being