carsick vs airsick

carsick and airsick both are adjectives.

Word	Noun	Adjective	Verb	Adverb
carsick	No	Yes	No	No
airsick	No	Yes	No	No

As adjectives, carsick and airsick are synonyms defined as:

Other synonyms of carsick include air sick, seasick.

carsick (adjective)	airsick (adjective)
experiencing motion sickness	experiencing motion sickness