slam-dunk vs dunk

slam-dunk is not a noun while dunk is a noun.

Word	Noun	Adjective	Verb	Adverb
slam-dunk	No	No	Yes	No
dunk	Yes	No	Yes	No

As verbs, dunk is a hypernym of slam-dunk; that is, dunk is a word with a broader meaning than slam-dunk:

slam-dunk (noun)	dunk (noun)
	a basketball shot in which the basketball is propelled downward into the basket

slam-dunk (verb)	dunk (verb)
make a slam dunk; shoot a basketball in a slam dunk	dip into a liquid while eating
make a forceful move against	immerse briefly into a liquid so as to wet, coat, or saturate
	make a dunk shot, in basketball