surreptitious vs hugger-mugger

surreptitious is not a noun while hugger-mugger is a noun.

Word	Noun	Adjective	Verb	Adverb
surreptitious	No	Yes	No	No
hugger-mugger	Yes	Yes	No	Yes

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

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

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

surreptitious (noun)	hugger-mugger (noun)
	a state of confusion

surreptitious (adjective)	hugger-mugger (adjective)
marked by quiet and caution and secrecy; taking pains to avoid being observed	conducted with or marked by hidden aims or methods
conducted with or marked by hidden aims or methods	in utter disorder

surreptitious (adverb)	hugger-mugger (adverb)
	in secrecy