nonsmoker vs nonsmoking car

nonsmoker and nonsmoking car both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonsmoker	Yes	No	No	No
nonsmoking car	Yes	No	No	No

As nouns, nonsmoker and nonsmoking car are synonyms defined as:

nonsmoker and nonsmoking car: a passenger car for passengers who want to avoid tobacco smoke

nonsmoker (noun)	nonsmoking car (noun)
a passenger car for passengers who want to avoid tobacco smoke	a passenger car for passengers who want to avoid tobacco smoke
a person who does not smoke tobacco