cloak-and-dagger vs hugger-mugger

cloak-and-dagger is not a noun while hugger-mugger is a noun.

Word	Noun	Adjective	Verb	Adverb
cloak-and-dagger	No	Yes	No	No
hugger-mugger	Yes	Yes	No	Yes

As adjectives, cloak-and-dagger and hugger-mugger are synonyms defined as:

cloak-and-dagger and hugger-mugger: conducted with or marked by hidden aims or methods

Other synonyms of cloak-and-dagger include clandestine, hole-and-corner, hush-hush, secret, surreptitious, undercover, underground.

cloak-and-dagger (noun)	hugger-mugger (noun)
	a state of confusion

cloak-and-dagger (adjective)	hugger-mugger (adjective)
conducted with or marked by hidden aims or methods	conducted with or marked by hidden aims or methods
	in utter disorder

cloak-and-dagger (adverb)	hugger-mugger (adverb)
	in secrecy