javelin vs field event

javelin and field event both are nouns.

Word	Noun	Adjective	Verb	Adverb
javelin	Yes	No	No	No
field event	Yes	No	No	No

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

javelin: an athletic competition in which a javelin is thrown as far as possible
field event: a competition that takes place on a field rather than on a running track

javelin (noun)	field event (noun)
a spear thrown as a weapon or in competitive field events	a competition that takes place on a field rather than on a running track
an athletic competition in which a javelin is thrown as far as possible