pay dirt vs success

pay dirt and success both are nouns.

Word	Noun	Adjective	Verb	Adverb
pay dirt	Yes	No	No	No
success	Yes	No	No	No

As nouns, success is a hypernym of pay dirt; that is, success is a word with a broader meaning than pay dirt:

pay dirt (noun)	success (noun)
a profitable success	an attainment that is successful
ore that yields a substantial profit to the miner	an event that accomplishes its intended purpose
	a person with a record of successes
	a state of prosperity or fame