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

熟々[tsukuzuku] completely
円熟[enjuku] ripeness
黄熟[koujuku] ripening and turning yellow
噛熟す[kamikonasu] to chew
完熟[kanjuku] completely ripe or mature

使い熟す[tsukaikonasu] to handle (men)
四字熟語[yojijukugo] four-character idiomatic compounds
修熟[shuujuku] developing skill
習熟[shuujuku] skilled
熟す[jukusu] to ripen