live axle vs axle

live axle and axle both are nouns.

Word	Noun	Adjective	Verb	Adverb
live axle	Yes	No	No	No
axle	Yes	No	No	No

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

live axle: the axle of a self-propelled vehicle that provides the driving power
axle: a shaft on which a wheel rotates

live axle (noun)	axle (noun)
the axle of a self-propelled vehicle that provides the driving power	a shaft on which a wheel rotates