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

育成栽培[ikuseisaibai] vegetable and fruit growing
栽培[saibai] cultivation
栽培種[saibaishu] agricultural species
栽培所[saibaijo] plantation
純粋培養[junsuibaiyou] clean (pure) culture

促成栽培[sokuseisaibai] raising out-of-season crops with artificial heat
培う[tsuchikau] to cultivate
培養[baiyou] cultivation
培養液[baiyoueki] culture fluid
培地[baichi] culture medium