conjunctiva vs mucous membrane

conjunctiva and mucous membrane both are nouns.

Word	Noun	Adjective	Verb	Adverb
conjunctiva	Yes	No	No	No
mucous membrane	Yes	No	No	No

As nouns, mucous membrane is a hypernym of conjunctiva; that is, mucous membrane is a word with a broader meaning than conjunctiva:

conjunctiva: a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelid
mucous membrane: mucus-secreting membrane lining all body cavities or passages that communicate with the exterior

Other hypernyms of conjunctiva include mucosa.

conjunctiva (noun)	mucous membrane (noun)
a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelid	mucus-secreting membrane lining all body cavities or passages that communicate with the exterior