plaster machine vs plastering machine

plaster machine and plastering machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
plaster machine	Yes	No	No	No
plastering machine	Yes	No	No	No

As nouns, plaster machine and plastering machine are synonyms defined as:

Other synonyms of plaster machine include rendering machine.

plaster machine (noun)	plastering machine (noun)
a machine for wall rendering.	a machine for wall rendering.