whiz-kid vs ball of fire

whiz-kid and ball of fire both are nouns.

Word	Noun	Adjective	Verb	Adverb
whiz-kid	Yes	No	No	No
ball of fire	Yes	No	No	No

As nouns, whiz-kid and ball of fire are synonyms defined as:

Other synonyms of whiz-kid include go-getter, whizz-kid.

whiz-kid (noun)	ball of fire (noun)
someone whose career progresses rapidly	someone whose career progresses rapidly
	a highly energetic and indefatigable person