謹啓[kinkei] Dear Sir or Madam
啓く[hiraku] to enlighten
啓示[keiji] revelation (i.e. divine revelation)
啓発[keihatsu] enlightenment
啓蒙[keimou] enlightenment

啓蟄[keichitsu] "awakening of insects" solar term (approx. Mar. 6, the day on which hibernating insects are said to come out of the ground)
天啓[tenkei] (divine) revelation
拝啓[haikei] Dear (so and so)
啓上[keijou] speaking respectfully
啓迪[keiteki] edification

黄金崇拝[ougonsuuhai] mammon worship
九拝[kyuuhai] bowing many times (in apology)
偶像崇拝[guuzousuuhai] worship
偶像礼拝[guuzoureihai] idolatry
再拝[saihai] bowing twice

三拝[sanpai] adoration which is performed three times or repeatedly
三拝九拝[sanpaikyuuhai] kowtowing
参拝[sanpai] visit to a shrine or temple
崇拝[suuhai] worship
祖先崇拝[sosensuuhai] ancestor worship