humbug vs meaninglessness

humbug and meaninglessness both are nouns.

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

As nouns, meaninglessness is a hypernym of humbug; that is, meaninglessness is a word with a broader meaning than humbug:

Other hypernyms of humbug include bunk, hokum, nonsense, nonsensicality.

humbug (noun)	meaninglessness (noun)
something intended to deceive; deliberate trickery intended to gain an advantage	the quality of having no value or significance
pretentious or silly talk or writing	a message that seems to convey no meaning
communication (written or spoken) intended to deceive

humbug (verb)	meaninglessness (verb)
trick or deceive