空オケ[karaoke] karaoke (singing to taped accompaniment)
ベクトル空間[bekutorukuukan] vector space
茜さす空[akanesasusora] glowing sky
圧搾空気[assakukuuki] compressed air
圧縮空気[asshukukuuki] compressed air

位相空間[isoukuukan] phase space (physics)
宇宙空間[uchuukuukan] outer space
雨空[amazora] rainy sky
英国航空[eikokukoukuu] British Airways
仮想空間[kasoukuukan] virtual space (e.g. in computer graphics)

おみ籤[omikuji] written oracle
抽籤[chuusen] lottery
抽籤券[chuusenken] lottery ticket
貧乏籤[binboukuji] unlucky number
宝籤[takarakuji] lottery

本籤[honkuji] first prize in a private lottery
籤引[kujibiki] lottery
当籤[tousen] winning (in a lottery, raffle, etc.)
空籤[karakuji] a blank (ticket)