protective fold vs lid

protective fold and lid both are nouns.

Word	Noun	Adjective	Verb	Adverb
protective fold	Yes	No	No	No
lid	Yes	No	No	No

As nouns, lid is a hyponym of protective fold; that is, lid is a word with a more specific, narrower meaning than protective fold:

Other hyponyms of protective fold include eyelid, palpebra, nictitating membrane, third eyelid.

protective fold (noun)	lid (noun)
a flap of tissue that protects what it covers	a movable top or cover (hinged or separate) for closing the opening at the top of a box, chest, jar, pan, etc.
	headdress that protects the head from bad weather; has shaped crown and usually a brim
	either of two folds of skin that can be moved to cover or open the eye