contend vs joust

contend is not a noun while joust is a noun.

Word	Noun	Adjective	Verb	Adverb
contend	No	No	Yes	No
joust	Yes	No	Yes	No

As verbs, joust is a hyponym of contend; that is, joust is a word with a more specific, narrower meaning than contend:

contend (noun)	joust (noun)
	a combat between two mounted knights tilting against each other with blunted lances

contend (verb)	joust (verb)
to make the subject of dispute, contention, or litigation	joust against somebody in a tournament by fighting on horseback
have an argument about something
maintain or assert
compete for something; engage in a contest; measure oneself against others
be engaged in a fight; carry on a fight
succeed in doing, achieving, or producing (something) with the limited or inadequate means available