derelict vs flea-bitten

derelict is a noun but flea-bitten is not a noun.

Word	Noun	Adjective	Verb	Adverb
derelict	Yes	Yes	No	No
flea-bitten	No	Yes	No	No

As adjectives, derelict and flea-bitten are synonyms defined as:

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

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

derelict (adjective)	flea-bitten (adjective)
in deplorable condition	worn and broken down by hard use
failing in what duty requires
forsaken by owner or inhabitants
worn and broken down by hard use