innocuous vs innocent

innocuous is not a noun while innocent is a noun.

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

As adjectives, innocuous and innocent are synonyms defined as:

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

innocuous (adjective)	innocent (adjective)
not injurious to physical or mental health	free from evil or guilt
lacking intent or capacity to injure	lacking intent or capacity to injure
not causing disapproval	lacking in sophistication or worldliness
	completely wanting or lacking
	(used of things) lacking sense or awareness
	not knowledgeable about something specified
	free from sin