doughnut machine vs deep fryer

doughnut machine and deep fryer both are nouns.

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

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

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

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

doughnut machine (noun)	deep 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.