bowl

Short for ボール紙 (bōru-gami): non-corrugated cardboard, pasteboard / Short for 段ボール (danbōru): corrugated cardboard

ball (formal dance event)

a target, a mark, a bullseye / an objective, an object (of doing something)

as far as ... is concerned; in terms of ...

(baseball, softball) Synonym of 四球 (shikyū, “walk”)

ball person

disco ball, mirrorball

Synonym of 球技 (kyūgi, “ball game”)

(idiomatic) to avoid being seen; to be clandestine