Kyūjitai form of 代数学 (“algebra”)

rest; remainder / excess; surplus; overage

prep school, cram school; privately-run schools marketed to students taking examinations for college admissions

Alternative form of 白河夜船 (shirakawa yofune)

to call; to call out / to call, to apply a name to someone / to send for someone, to call for someone, to get someone / to call something by a name; to designate / to invite

reserve (that which is reserved, or kept back, as for future use), spare, preliminaries

call back, recall

four / fourth

birds of a feather flock together

four, 4