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)

にいにい蝉[niiniizemi] Kaempfer cicada (Platypleura kaempferi)
みんみん蝉[minminzemi] Oncotympana maculaticollis (large black and green species of Oriental cicada)
夏蝉[natsuzemi] summer cicadas
蝉時雨[semishigure] outburst of cricket chirping
川蝉[kawasemi] kingfisher (esp. the common kingfisher, Alcedo atthis)

油蝉[aburazemi] large brown cicada (Graptopsaltria nigrofuscata)
虚蝉[utsusomi] man of this world
松蝉[matsuzemi] cicada abundant in late spring
唖蝉[oshizemi] voiceless cicada (female)