開催[kaisai] holding a meeting
開催式[kaisaishiki] opening ceremony (of an event, show, etc.)
開催中[kaisaichuu] in session
共催[kyousai] joint sponsorship
催し[moyooshi] event

催物[moyoushimono] points of interest
催す[moyoosu] to hold (a meeting)
催淫剤[saiinzai] aphrodisiac
催合う[moyau] to co-operate (in enterprises)
催告[saikoku] notification

嘘を吐く[usowotsuku] to tell a lie
嘘吐き[usotsuki] liar (sometimes said with not much seriousness)
弱音を吐く[yowanewohaku] to whine
息を吐く[ikiwotsuku] to take a breath
吐気[hakike] nausea

吐き捨てる[hakisuteru] to spit out
吐き出す[hakidasu] to vomit
吐く[tsuku] to breathe out
吐血[toketsu] vomiting of blood
吐息[toiki] sigh