お七夜[oshichiya] name-giving ceremony
七つ[nanatsu] seven
七つの海[nanatsunoumi] the seven seas
七屋[nanatsuya] pawnshop
七回忌[shichikaiki] seventh anniversary of a death

七角形[shichikakkei] heptagon
七曲がり[nanamagari] tortuous or spiral (path)
七月[shichigatsu] July
七賢[shichiken] the Seven Wise Men (of Confucius's Analects)

何曜日[nanyoubi] what day?
火曜[kayou] Tuesday
火曜日[kayoubi] Tuesday
灰の水曜日[hainosuiyoubi] Ash Wednesday
金曜[kinyou] Friday

金曜日[kinyoubi] Friday
月曜[getsuyou] Monday
月曜日[getsuyoubi] Monday
黒曜岩[kokuyougan] obsidian
黒曜石[kokuyouseki] obsidian