Force feed and Mechanical system

Force feed noun - Mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings.

Mechanical system and force feed are semantically related. In some cases you can use "Mechanical system" instead a noun phrase "Force feed".

Mechanical system noun - A system of elements that interact on mechanical principles.

Force feed and mechanical system are semantically related. Sometimes you can replace phrase "Force feed" with "Mechanical system", this phrases are similar.