lubricating substance vs lubricant

lubricating substance and lubricant both are nouns.

Word	Noun	Adjective	Verb	Adverb
lubricating substance	Yes	No	No	No
lubricant	Yes	No	No	No

As nouns, lubricating substance and lubricant are synonyms defined as:

lubricating substance and lubricant: a substance capable of reducing friction by making surfaces smooth or slippery

Other synonyms of lubricating substance include lube, lubricator.

lubricating substance (noun)	lubricant (noun)
a substance capable of reducing friction by making surfaces smooth or slippery	a substance capable of reducing friction by making surfaces smooth or slippery