dunk vs slam dunk

dunk and slam dunk both are nouns.

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

As nouns, slam dunk is a hyponym of dunk; that is, slam dunk is a word with a more specific, narrower meaning than dunk:

dunk: a basketball shot in which the basketball is propelled downward into the basket
slam dunk: a forceful dunk

dunk (noun)	slam dunk (noun)
a basketball shot in which the basketball is propelled downward into the basket	a forceful dunk
	something that is a sure to occur; a foregone conclusion

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