dicer vs mechanical device

dicer and mechanical device both are nouns.

Word	Noun	Adjective	Verb	Adverb
dicer	Yes	No	No	No
mechanical device	Yes	No	No	No

As nouns, mechanical device is a hypernym of dicer; that is, mechanical device is a word with a broader meaning than dicer:

dicer: a mechanical device used for dicing food
mechanical device: mechanism consisting of a device that works on mechanical principles

dicer (noun)	mechanical device (noun)
a mechanical device used for dicing food	mechanism consisting of a device that works on mechanical principles