用意・ようい: get ready - basically it means the same as 準備 but it isn't used as often.
準備・ じゅんび: to get ready (to go to school, to go on vacation, to go camping)
備える そなえる - prepare, in the sense of set some shit aside for an emergency. (for instance, by saving money for a rainy day, or by stocking the basement with canned food for when the Apocalypse comes).
ｘｘｘしておく： to arrange something in advance ('Come over at 8, I'll have the beer chilled and ready.' 'I'll have the apartment cleaned and ready for our communist meeting.')
訓： もう＊ける： to establish, provide, prepare ???? (**)