lance vs javelin

lance and javelin both are nouns.

Word	Noun	Adjective	Verb	Adverb
lance	Yes	No	Yes	No
javelin	Yes	No	No	No

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

Other hyponyms of lance include assagai, assegai, pike, trident.

lance (noun)	javelin (noun)
a long pointed rod used as a tool or weapon	a spear thrown as a weapon or in competitive field events
an implement with a shaft and barbed point used for catching fish	an athletic competition in which a javelin is thrown as far as possible
a surgical knife with a pointed double-edged blade; used for punctures and small incisions

lance (verb)	javelin (verb)
open by piercing with a lancet
pierce with a lance, as in a knights' fight
move quickly, as if by cutting one's way