cracking vs smashing

cracking and smashing both are nouns.

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

As adjectives, cracking and smashing are synonyms defined as:

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

cracking (noun)	smashing (noun)
the act of cracking something	the act of breaking something into small pieces
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)

cracking (adjective)	smashing (adjective)
excellent	excellent