doughnut machine vs donut fryer

doughnut machine and donut fryer both are nouns.

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

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

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

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

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