old vs cracking

old and cracking both are nouns.

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

As adjectives, old and cracking are synonyms defined as:

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

old (noun)	cracking (noun)
past times	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)

old (adjective)	cracking (adjective)
of long duration; not new	excellent
(used especially of persons) having lived for a relatively long time or attained a specific age
skilled through long experience
(used for emphasis) very familiar
excellent
just preceding something else in time or order
belonging to some prior time