seasickness vs naupathia

seasickness and naupathia both are nouns.

Word	Noun	Adjective	Verb	Adverb
seasickness	Yes	No	No	No
naupathia	Yes	No	No	No

As nouns, seasickness and naupathia are synonyms defined as:

seasickness and naupathia: motion sickness experienced while traveling on water

Other synonyms of seasickness include mal de mer.

seasickness (noun)	naupathia (noun)
motion sickness experienced while traveling on water	motion sickness experienced while traveling on water