shooter vs crack shot

shooter and crack shot both are nouns.

Word	Noun	Adjective	Verb	Adverb
shooter	Yes	No	No	No
crack shot	Yes	No	No	No

As nouns, crack shot is a hyponym of shooter; that is, crack shot is a word with a more specific, narrower meaning than shooter:

shooter: a person who shoots (usually with respect to their ability to shoot)
crack shot: someone skilled in shooting

Other hyponyms of shooter include marksman, sharpshooter, gun, gunman, trapshooter.

shooter (noun)	crack shot (noun)
a large marble used for shooting in the game of marbles	someone skilled in shooting
a person who shoots (usually with respect to their ability to shoot)
a professional killer who uses a gun
(sports) a player who drives or kicks a ball at the goal (or a basketball player who shoots at the basket)
a gambler who throws dice in the game of craps