car vs handcar

car and handcar both are nouns.

Word	Noun	Adjective	Verb	Adverb
car	Yes	No	No	No
handcar	Yes	No	No	No

As nouns, handcar is a hyponym of car; that is, handcar is a word with a more specific, narrower meaning than car:

car (noun)	handcar (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a small railroad car propelled by hand or by a small motor
a wheeled vehicle adapted to the rails of railroad
where passengers ride up and down
the compartment that is suspended from an airship and that carries personnel and the cargo and the power plant
a conveyance for passengers or freight on a cable railway