whiteboard

The white Mahjong dragon tile without any markings. / (figuratively) (sex) name for the glabrousness of an individual, usually a female, who lacks pubic hair either naturally or due to removal.

classroom

big, large, great

in front of, before, ago,

before / in front

in front (of) / before (in time)

(slang) Alternative form of 大きいお友達

(education) instruction that takes place outside of a classroom (field trip, etc.) / (education) class that takes place in its own specialized room instead of homeroom (such as music or cooking)

the last, the previous / pre- (of an era)