whiz vs track star

whiz and track star both are nouns.

Word	Noun	Adjective	Verb	Adverb
whiz	Yes	No	Yes	No
track star	Yes	No	No	No

As nouns, track star is a hyponym of whiz; that is, track star is a word with a more specific, narrower meaning than whiz:

whiz (noun)	track star (noun)
a buzzing or hissing sound as of something traveling rapidly through the air	a star runner
someone who is dazzlingly skilled in any field

whiz (verb)	track star (verb)
make a soft swishing sound