core shooting machine vs core shooter

core shooting machine and core shooter both are nouns.

Word	Noun	Adjective	Verb	Adverb
core shooting machine	Yes	No	No	No
core shooter	Yes	No	No	No

As nouns, core shooting machine and core shooter are synonyms defined as:

core shooting machine and core shooter: a machine used in the core shooting process for the production of sand cores.

core shooting machine (noun)	core shooter (noun)
a machine used in the core shooting process for the production of sand cores.	a machine used in the core shooting process for the production of sand cores.