rider vs motorcar

rider and motorcar both are nouns.

Word	Noun	Adjective	Verb	Adverb
rider	Yes	No	No	No
motorcar	Yes	No	No	No

rider (noun)	motorcar (noun)
a clause that is appended to a legislative bill	a motor vehicle with four wheels; usually propelled by an internal combustion engine
a traveler who actively rides an animal (as a horse or camel)
a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
a traveler who actively rides a vehicle (as a bicycle or motorcycle)