bust vs stone-broke

bust is a noun but stone-broke is not a noun.

Word	Noun	Adjective	Verb	Adverb
bust	Yes	Yes	Yes	No
stone-broke	No	Yes	No	No

As adjectives, bust and stone-broke are synonyms defined as:

Other synonyms of bust include broke, skint, stony-broke.

bust (noun)	stone-broke (noun)
an occasion for excessive eating or drinking
a sculpture of the head and shoulders of a person
the chest of a woman
a complete failure

bust (adjective)	stone-broke (adjective)
lacking funds	lacking funds

bust (verb)	stone-broke (verb)
break open or apart suddenly and forcefully
go to pieces
ruin completely
separate or cause to separate abruptly
search without warning, make a sudden surprise attack on