neuropil vs nerve tissue

neuropil and nerve tissue both are nouns.

Word	Noun	Adjective	Verb	Adverb
neuropil	Yes	No	No	No
nerve tissue	Yes	No	No	No

As nouns, nerve tissue is a hypernym of neuropil; that is, nerve tissue is a word with a broader meaning than neuropil:

neuropil: the complex network of unmyelinated axones, dendrites, and glial branches that form the bulk of the central nervous system's grey matter and in which nerve cell bodies are embedded
nerve tissue: tissue composed of neurons

Other hypernyms of neuropil include nervous tissue.

neuropil (noun)	nerve tissue (noun)
the complex network of unmyelinated axones, dendrites, and glial branches that form the bulk of the central nervous system's grey matter and in which nerve cell bodies are embedded	tissue composed of neurons