ingenuous vs innocent

ingenuous is not a noun while innocent is a noun.

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

As adjectives, ingenuous and innocent are synonyms defined as:

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

ingenuous (adjective)	innocent (adjective)
characterized by an inability to mask your feelings; not devious	free from evil or guilt
lacking in sophistication or worldliness	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