withered vs dried-up

withered and dried-up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
withered	No	Yes	No	No
dried-up	No	Yes	No	No

As adjectives, withered and dried-up are synonyms defined as:

withered and dried-up: (used especially of vegetation) having lost all moisture

Other synonyms of withered include sear, sere, shriveled, shrivelled.

withered (adjective)	dried-up (adjective)
(used especially of vegetation) having lost all moisture	depleted of water
lean and wrinkled by shrinkage as from age or illness	(used especially of vegetation) having lost all moisture