afraid vs timid

afraid is not a noun while timid is a noun.

Word	Noun	Adjective	Verb	Adverb
afraid	No	Yes	No	No
timid	Yes	Yes	No	No

afraid (noun)	timid (noun)
	people who are fearful and cautious

afraid (adjective)	timid (adjective)
filled with fear or apprehension	showing fear and lack of confidence
filled with regret or concern; used often to soften an unpleasant statement	lacking self-confidence
having feelings of aversion or unwillingness	lacking conviction or boldness or courage
feeling worry or concern or insecurity