benign vs harmless

benign and harmless both are adjectives.

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

benign (adjective)	harmless (adjective)
pleasant and beneficial in nature or influence	not causing or capable of causing harm
not dangerous to health; not recurrent or progressive (especially of a tumor)
kindness of disposition or manner