kinetosis vs mal de mer

kinetosis and mal de mer both are nouns.

Word	Noun	Adjective	Verb	Adverb
kinetosis	Yes	No	No	No
mal de mer	Yes	No	No	No

As nouns, mal de mer is a hyponym of kinetosis; that is, mal de mer is a word with a more specific, narrower meaning than kinetosis:

kinetosis: the state of being dizzy or nauseated because of the motions that occur while traveling in or on a moving vehicle
mal de mer: motion sickness experienced while traveling on water

Other hyponyms of kinetosis include air sickness, airsickness, car sickness, naupathia, seasickness.

kinetosis (noun)	mal de mer (noun)
the state of being dizzy or nauseated because of the motions that occur while traveling in or on a moving vehicle	motion sickness experienced while traveling on water