いい年をして[iitoshiwoshite] (in spite of) being old enough to know better
亥年[idoshi] year of the boar
一箇年[ikkanen] one year
一周年[isshuunen] one full year
一年以内に[ichineninaini] within a year

一年間[ichinenkan] (period of) one year
一年生[ichinensei] annual (plant)
一年草[ichinensou] annual (plant)
一年ぢゅう[ichinenjuu] all year round
一両年[ichiryounen] (a) year or two

陥没[kanbotsu] cave-in
収没[shuubotsu] confiscation of possessions
出没[shutsubotsu] appearing frequently
神出鬼没[shinshutsukibotsu] appearing in unexpected places and at unexpected moments
水没[suibotsu] submerge

戦没[senbotsu] death in battle
戦没者[senbotsusha] persons who have fallen in battle
戦没者追悼記念日[senbotsushatsuitoukinenbi] Memorial Day (US)
沈没[chinbotsu] sinking
日没[nichibotsu] sunset

お生憎様[oainikusama] that's too bad (ironical)
御誕生日おめでとうございます[otanjoubiomedetougozaimasu] Happy Birthday
隣の芝生は青い[tonarinoshibafuhaaoi] the grass is always greener on the other side
生きがいい[ikigaii] fresh (e.g. fish)
コンピューター援用生産[konpyuutaaenyouseisan] computer-aided manufacture

委託生[itakusei] scholarship student sent by government office or business
生す[nasu] to build up
異常発生[ijouhassei] plague
医学生[igakusei] medical student
医学生物学[igakuseibutsugaku] medical biology