donut machine vs fryer

donut machine and fryer both are nouns.

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

As nouns, fryer is a hypernym of donut machine; that is, fryer is a word with a broader meaning than donut machine:

donut machine: a machine used to fry large quantities of doughnuts at once.
fryer: A kitchen appliance for deep frying; its size depends on intended use.

Other hypernyms of donut machine include machine, deep fat fryer, deep fryer, frier, fryolator.

donut machine (noun)	fryer (noun)
a machine used to fry large quantities of doughnuts at once.	A kitchen appliance for deep frying; its size depends on intended use.
	flesh of a medium-sized young chicken suitable for frying