doughnut machine vs doughnut fryer

doughnut machine and doughnut fryer both are nouns.

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

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

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

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

doughnut 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.