humbug vs bunk

humbug and bunk both are nouns.

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

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

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

humbug (noun)	bunk (noun)
something intended to deceive; deliberate trickery intended to gain an advantage	a bed on a ship or train; usually in tiers
pretentious or silly talk or writing	a rough bed (as at a campsite)
communication (written or spoken) intended to deceive	beds built one above the other
	a long trough for feeding cattle
	unacceptable behavior (especially ludicrously false statements)
	a message that seems to convey no meaning

humbug (verb)	bunk (verb)
trick or deceive	flee; take to one's heels; cut and run
	provide with a bunk
	avoid paying