derelict vs decrepit

derelict is a noun but decrepit is not a noun.

Word	Noun	Adjective	Verb	Adverb
derelict	Yes	Yes	No	No
decrepit	No	Yes	No	No

As adjectives, derelict and decrepit are synonyms defined as:

Other synonyms of derelict include creaky, flea-bitten, run-down, woebegone.

derelict (noun)	decrepit (noun)
a ship abandoned on the high seas
a person without a home, job, or property

derelict (adjective)	decrepit (adjective)
in deplorable condition	lacking bodily or muscular strength or vitality
failing in what duty requires	worn and broken down by hard use
forsaken by owner or inhabitants
worn and broken down by hard use