donut machine vs deep fat fryer

donut machine and deep fat fryer both are nouns.

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

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

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

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

donut machine (noun)	deep fat 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.