a light vehicle, standard vehicle, (specifically) a passenger vehicle no more than 4.7 meters in length, with engine displacement between 660 and 2,000 cubic centimeters

a heavy vehicle, (especially) a truck with a payload of 6.5 tons or more, or a passenger vehicle seating 30 people or more

Kyūjitai form of 歯車 (“gear”)

hearse (Oxcart used as a hearse for nobles or the emperor in ancient Japan. The wheels had metal spokes that scraped them, producing a screeching resembling sad wailing.)

Synonym of 火車 (“fiery chariot that brings sinners to hell”)

(military) antitank

water truck, a vehicle designed to carry and spray water

speed reading

four months (duration)

Synonym of 四季 (shiki, “four seasons”) / four (o'clock)