donut machine vs doughnut fryer

donut machine and doughnut fryer both are nouns.

Word	Noun	Adjective	Verb	Adverb
donut machine	Yes	No	No	No
doughnut fryer	Yes	No	No	No

As nouns, donut machine and doughnut fryer are synonyms defined as:

donut machine and doughnut fryer: a machine used to fry large quantities of doughnuts at once.

Other synonyms of donut machine include donut fryer, doughnut machine.

donut machine (noun)	doughnut fryer (noun)
a machine used to fry large quantities of doughnuts at once.	a machine used to fry large quantities of doughnuts at once.