strung-out vs dependent

strung-out is not a noun while dependent is a noun.

Word	Noun	Adjective	Verb	Adverb
strung-out	No	Yes	No	No
dependent	Yes	Yes	No	No

As adjectives, strung-out and dependent are synonyms defined as:

Other synonyms of strung-out include dependant, drug-addicted, hooked.

strung-out (noun)	dependent (noun)
	a person who relies on another person for support (especially financial support)

strung-out (adjective)	dependent (adjective)
addicted to a drug	relying on or requiring a person or thing for support, supply, or what is needed
	(of a clause) unable to stand alone syntactically as a complete sentence
	addicted to a drug
	contingent on something else
	being under the power or sovereignty of another or others
	held from above and hanging down