fickle vs volatile

fickle is not a noun while volatile is a noun.

Word	Noun	Adjective	Verb	Adverb
fickle	No	Yes	No	No
volatile	Yes	Yes	No	No

As adjectives, fickle and volatile are synonyms defined as:

fickle and volatile: marked by erratic changeableness in affections or attachments

fickle (noun)	volatile (noun)
	a volatile substance; a substance that changes readily from solid or liquid to a vapor

fickle (adjective)	volatile (adjective)
liable to sudden unpredictable change	evaporating readily at normal temperatures and pressures
marked by erratic changeableness in affections or attachments	tending to vary often or widely
	marked by erratic changeableness in affections or attachments
	liable to lead to sudden change or violence