mile vs track event

mile and track event both are nouns.

Word	Noun	Adjective	Verb	Adverb
mile	Yes	No	No	No
track event	Yes	No	No	No

As nouns, track event is a hypernym of mile; that is, track event is a word with a broader meaning than mile:

mile (noun)	track event (noun)
a footrace extending one mile	a footrace performed on a track (indoor or outdoor)
a unit of length equal to 1,760 yards or 5,280 feet; exactly 1609.344 meters
a Swedish unit of length equivalent to 10 km
an ancient Roman unit of length equivalent to 1620 yards
a unit of length used in navigation; exactly 1,852 meters; historically based on the distance spanned by one minute of arc in latitude
a former British unit of length once used in navigation; equivalent to 6,000 feet (1828.8 meters)
a former British unit of length equivalent to 6,080 feet (1,853.184 meters); 800 feet longer than a statute mile
a large distance