grade (level)

the highest; the best; supreme; the greatest

車: car; wheel

upgrade

to upgrade

a car, an automobile, a carriage, a cart / a wheel, a caster / something wheel-shaped / a style of 紋 (mon, “family crest”) / short for 車海老 (kuruma ebi): a prawn

vehicle

vehicle / train car

used to count vehicles

upgrade (an improved component or replacement item)