machine vs rider

machine and rider both are nouns.

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

machine (noun)	rider (noun)
any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks	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 device for overcoming resistance at one point by applying force at some other point	a traveler riding in a vehicle (a boat or bus or car or plane or train etc) who is not operating it
a group that controls the activities of a political party	a traveler who actively rides a vehicle (as a bicycle or motorcycle)
an intricate organization that accomplishes its goals efficiently
an efficient person

machine (verb)	rider (verb)
make by machinery
turn, shape, mold, or otherwise finish by machinery