success vs highflyer

success and highflyer both are nouns.

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

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

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

success (noun)	highflyer (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