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)

蒼穹[soukyuu] blue sky

穹窿[kyuuryuu] vault (a poetic term for clear skies)

諳誦[anshou] recitation
諳んじる[soranjiru] to memorize
諳記[anki] memorization

諳譜[anpu] memorizing musical scores
丸諳記[maruanki] indiscriminate memorizing

諷刺[fuushi] satire
諷諌[fuukan] indirect remonstrance
諷する[fuusuru] to hint
諷喩[fuuyu] hint
諷誦[fuuju] reciting

花鳥諷詠[kachoufuuei] the beauties of nature as the key poetic theme
諷詠[fuuei] poetic composition
諷歌[soeuta] allegorical form (of waka)
諷経[fugin] chanting of the sutras

霄壌[shoujou] heaven and earth
凌霄花[nouzenkazura] Chinese trumpet creeper (Campsis grandiflora)
凌霄葉蓮[nouzenharen] nasturtium (species of Indian cress, Tropaeolum majus)

凌霄[ryoushou] Chinese trumpet creeper (Campsis grandiflora)
霄漢[shoukan] sky