pressure feed vs pressure-feed lubricating system

pressure feed and pressure-feed lubricating system both are nouns.

Word	Noun	Adjective	Verb	Adverb
pressure feed	Yes	No	No	No
pressure-feed lubricating system	Yes	No	No	No

As nouns, pressure feed and pressure-feed lubricating system are synonyms defined as:

pressure feed and pressure-feed lubricating system: mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings

Other synonyms of pressure feed include force-feed lubricating system, force feed, lubricating system.

pressure feed (noun)	pressure-feed lubricating system (noun)
mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings	mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings