benign vs benignant

benign and benignant both are adjectives.

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

As adjectives, benign and benignant are synonyms defined as:

benign (adjective)	benignant (adjective)
pleasant and beneficial in nature or influence	pleasant and beneficial in nature or influence
not dangerous to health; not recurrent or progressive (especially of a tumor)	characterized by kindness and warm courtesy especially of a king to his subjects
kindness of disposition or manner