sensation vs track star

sensation and track star both are nouns.

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

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

sensation (noun)	track star (noun)
an unelaborated elementary awareness of stimulation	a star runner
the faculty through which the external world is apprehended
a general feeling of excitement and heightened interest
someone who is dazzlingly skilled in any field
a state of widespread public excitement and interest