donut fryer vs doughnut machine

donut fryer and doughnut machine both are nouns.

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

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

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

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

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