harmless vs innocent

harmless is not a noun while innocent is a noun.

Word	Noun	Adjective	Verb	Adverb
harmless	No	Yes	No	No
innocent	Yes	Yes	No	No

harmless (noun)	innocent (noun)
	a person who lacks knowledge of evil

harmless (adjective)	innocent (adjective)
not causing or capable of causing harm	free from evil or guilt
	lacking intent or capacity to injure
	lacking in sophistication or worldliness
	completely wanting or lacking
	(used of things) lacking sense or awareness
	not knowledgeable about something specified
	free from sin