internal ear vs labyrinth

internal ear and labyrinth both are nouns.

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

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

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

Other synonyms of internal ear include inner ear.

internal 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