instigation vs fomentation

instigation and fomentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
instigation	Yes	No	No	No
fomentation	Yes	No	No	No

As nouns, instigation and fomentation are synonyms defined as:

instigation and fomentation: deliberate and intentional triggering (of trouble or discord)

instigation (noun)	fomentation (noun)
deliberate and intentional triggering (of trouble or discord)	deliberate and intentional triggering (of trouble or discord)
the verbal act of urging on	application of warm wet coverings to a part of the body to relieve pain and inflammation
	a substance used as a warm moist medicinal compress or poultice