struggle vs joust

struggle and joust both are nouns.

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

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

struggle: an energetic attempt to achieve something
joust: a combat between two mounted knights tilting against each other with blunted lances

Other hyponyms of struggle include duel, scramble, scuffle, tilt.

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

struggle (noun)	joust (noun)
strenuous effort	a combat between two mounted knights tilting against each other with blunted lances
an energetic attempt to achieve something
an open clash between two opposing groups (or individuals)

struggle (verb)	joust (verb)
be engaged in a fight; carry on a fight	joust against somebody in a tournament by fighting on horseback
to exert strenuous effort against opposition
climb awkwardly, as if by scrambling
make a strenuous or labored effort