humbug vs slang

humbug and slang both are nouns.

Word	Noun	Adjective	Verb	Adverb
humbug	Yes	No	Yes	No
slang	Yes	No	Yes	No

humbug (noun)	slang (noun)
something intended to deceive; deliberate trickery intended to gain an advantage	a characteristic language of a particular group (as among thieves)
pretentious or silly talk or writing	informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar
communication (written or spoken) intended to deceive