inner ear vs labyrinth

inner ear and labyrinth both are nouns.

Word	Noun	Adjective	Verb	Adverb
inner ear	Yes	No	No	No
labyrinth	Yes	No	No	No

As nouns, inner ear and labyrinth are synonyms defined as:

inner ear and labyrinth: a complex system of interconnecting cavities; concerned with hearing and equilibrium

Other synonyms of inner ear include internal ear.

inner ear (noun)	labyrinth (noun)
a complex system of interconnecting cavities; concerned with hearing and equilibrium	complex system of paths or tunnels in which it is easy to get lost
	a complex system of interconnecting cavities; concerned with hearing and equilibrium