donut fryer vs donut machine

donut fryer and donut machine both are nouns.

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

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

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

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

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