axle grease vs lubricating oil

axle grease and lubricating oil both are nouns.

Word	Noun	Adjective	Verb	Adverb
axle grease	Yes	No	No	No
lubricating oil	Yes	No	No	No

As nouns, lubricating oil is a hypernym of axle grease; that is, lubricating oil is a word with a broader meaning than axle grease:

axle grease: a thick heavy grease used to lubricate axles
lubricating oil: a thick fatty oil (especially one used to lubricate machinery)

Other hypernyms of axle grease include grease.

axle grease (noun)	lubricating oil (noun)
a thick heavy grease used to lubricate axles	a thick fatty oil (especially one used to lubricate machinery)