car sickness vs kinetosis

car sickness and kinetosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
car sickness	Yes	No	No	No
kinetosis	Yes	No	No	No

As nouns, kinetosis is a hypernym of car sickness; that is, kinetosis is a word with a broader meaning than car sickness:

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

Other hypernyms of car sickness include motion sickness.

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