first lady vs success

first lady and success both are nouns.

Word	Noun	Adjective	Verb	Adverb
first lady	Yes	No	No	No
success	Yes	No	No	No

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

Other hypernyms of first lady include achiever, succeeder, winner.

first lady (noun)	success (noun)
the wife of a chief executive	an attainment that is successful
the leading woman in an art or profession	an event that accomplishes its intended purpose
	a person with a record of successes
	a state of prosperity or fame