nifty vs cracking

nifty is not a noun while cracking is a noun.

Word	Noun	Adjective	Verb	Adverb
nifty	No	Yes	No	No
cracking	Yes	Yes	No	No

As adjectives, nifty and cracking are synonyms defined as:

Other synonyms of nifty include bang-up, bully, corking, dandy, great, groovy, keen, neat, not bad, old, peachy, slap-up, smashing, swell.

nifty (noun)	cracking (noun)
	the act of cracking something
	a sudden sharp noise
	the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process)

nifty (adjective)	cracking (adjective)
excellent	excellent