axle vs live axle

axle and live axle both are nouns.

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

As nouns, live axle is a hyponym of axle; that is, live axle is a word with a more specific, narrower meaning than axle:

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

Other hyponyms of axle include dead axle, journal, driving axle, trailing axle, blind axle.

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