(Internet slang, dated) Windows (an operating system)

window / (regional, dialect, Etchū region) a deep gap in a mountain ridge (so called for the way the wind blows through, like a window)

window

ball (sphere) / (basebal) ball (pitch that falls outside the strike zone)

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)

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

ball person

disco ball, mirrorball