osmoreceptor vs end organ

osmoreceptor and end organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
osmoreceptor	Yes	No	No	No
end organ	Yes	No	No	No

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

osmoreceptor: sensory end organ that responds to changes in osmotic pressure
end organ: a specialized structure at the peripheral end of some motor or sensory nerve fibers

osmoreceptor (noun)	end organ (noun)
sensory end organ that responds to changes in osmotic pressure	a specialized structure at the peripheral end of some motor or sensory nerve fibers