force feed vs mechanical system

force feed and mechanical system both are nouns.

Word	Noun	Adjective	Verb	Adverb
force feed	Yes	No	No	No
mechanical system	Yes	No	No	No

As nouns, mechanical system is a hypernym of force feed; that is, mechanical system is a word with a broader meaning than force feed:

force feed: mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings
mechanical system: a system of elements that interact on mechanical principles

force feed (noun)	mechanical system (noun)
mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings	a system of elements that interact on mechanical principles