mal de mer vs naupathia

mal de mer and naupathia both are nouns.

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

As nouns, mal de mer and naupathia are synonyms defined as:

mal de mer and naupathia: motion sickness experienced while traveling on water

Other synonyms of mal de mer include seasickness.

mal de mer (noun)	naupathia (noun)
motion sickness experienced while traveling on water	motion sickness experienced while traveling on water