meninges vs arachnoid

meninges and arachnoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
meninges	Yes	No	No	No
arachnoid	Yes	Yes	No	No

As nouns, arachnoid is a hyponym of meninges; that is, arachnoid is a word with a more specific, narrower meaning than meninges:

Other hyponyms of meninges include leptomeninges, dura, dura mater, arachnoid membrane, pia mater.

meninges (noun)	arachnoid (noun)
a membrane (one of 3) that envelops the brain and spinal cord	air-breathing arthropods characterized by simple eyes and four pairs of legs
	the middle of the 3 meninges

meninges (adjective)	arachnoid (adjective)
	relating to or resembling a member of the class Arachnida