motor end plate vs end organ

motor end plate and end organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
motor end plate	Yes	No	No	No
end organ	Yes	No	No	No

As nouns, end organ is a hypernym of motor end plate; that is, end organ is a word with a broader meaning than motor end plate:

motor end plate: the flattened end of a motor neuron that transmits neural impulses to a muscle
end organ: a specialized structure at the peripheral end of some motor or sensory nerve fibers

motor end plate (noun)	end organ (noun)
the flattened end of a motor neuron that transmits neural impulses to a muscle	a specialized structure at the peripheral end of some motor or sensory nerve fibers