leptomeninges vs meninx

leptomeninges and meninx both are nouns.

Word	Noun	Adjective	Verb	Adverb
leptomeninges	Yes	No	No	No
meninx	Yes	No	No	No

As nouns, meninx is a hypernym of leptomeninges; that is, meninx is a word with a broader meaning than leptomeninges:

leptomeninges: the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers
meninx: a membrane (one of 3) that envelops the brain and spinal cord

Other hypernyms of leptomeninges include meninges.

leptomeninges (noun)	meninx (noun)
the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers	a membrane (one of 3) that envelops the brain and spinal cord