乗客
じょうきゃく · joukyaku · JLPT N3 · noun
passenger
🚆 乗客 = ride (乗) + guest (客): a guest who rides
乗 (jou) is the ride/board character from 乗る (noru, to ride). 客 (kyaku) means guest or customer, as in お客さん. A passenger is simply the riding guest: jou + kyaku.