success vs highflier

success and highflier both are nouns.

Word	Noun	Adjective	Verb	Adverb
success	Yes	No	No	No
highflier	Yes	No	No	No

As nouns, highflier is a hyponym of success; that is, highflier is a word with a more specific, narrower meaning than success:

Other hyponyms of success include first lady, great, highflyer, natural, sleeper.

success (noun)	highflier (noun)
an attainment that is successful	a person of great ability and ambition
an event that accomplishes its intended purpose
a person with a record of successes
a state of prosperity or fame