Irish bull vs bunk

Irish bull and bunk both are nouns.

Word	Noun	Adjective	Verb	Adverb
Irish bull	Yes	No	No	No
bunk	Yes	No	Yes	No

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

Other hypernyms of Irish bull include buncombe, bunkum, guff, hogwash, rot.

Irish bull (noun)	bunk (noun)
Obscene word for unacceptable behavior	a bed on a ship or train; usually in tiers
	a rough bed (as at a campsite)
	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

Irish bull (verb)	bunk (verb)
	flee; take to one's heels; cut and run
	provide with a bunk
	avoid paying