drying up vs dehydration

drying up and dehydration both are nouns.

Word	Noun	Adjective	Verb	Adverb
drying up	Yes	No	No	No
dehydration	Yes	No	No	No

As nouns, drying up and dehydration are synonyms defined as:

Other synonyms of drying up include desiccation, evaporation.

drying up (noun)	dehydration (noun)
the process of extracting moisture	the process of extracting moisture
	dryness resulting from the removal of water
	depletion of bodily fluids